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Spatial navigation by congenitally blind individuals

Identifieur interne : 000610 ( Pmc/Curation ); précédent : 000609; suivant : 000611

Spatial navigation by congenitally blind individuals

Auteurs : Victor R. Schinazi ; Tyler Thrash ; Daniel Obert Chebat

Source :

RBID : PMC:4737291

Abstract

Spatial navigation in the absence of vision has been investigated from a variety of perspectives and disciplines. These different approaches have progressed our understanding of spatial knowledge acquisition by blind individuals, including their abilities, strategies, and corresponding mental representations. In this review, we propose a framework for investigating differences in spatial knowledge acquisition by blind and sighted people consisting of three longitudinal models (i.e., convergent, cumulative, and persistent). Recent advances in neuroscience and technological devices have provided novel insights into the different neural mechanisms underlying spatial navigation by blind and sighted people and the potential for functional reorganization. Despite these advances, there is still a lack of consensus regarding the extent to which locomotion and wayfinding depend on amodal spatial representations. This challenge largely stems from methodological limitations such as heterogeneity in the blind population and terminological ambiguity related to the concept of cognitive maps. Coupled with an over‐reliance on potential technological solutions, the field has diffused into theoretical and applied branches that do not always communicate. Here, we review research on navigation by congenitally blind individuals with an emphasis on behavioral and neuroscientific evidence, as well as the potential of technological assistance. Throughout the article, we emphasize the need to disentangle strategy choice and performance when discussing the navigation abilities of the blind population. WIREs Cogn Sci 2016, 7:37–58. doi: 10.1002/wcs.1375

For further resources related to this article, please visit the WIREs website.


Url:
DOI: 10.1002/wcs.1375
PubMed: 26683114
PubMed Central: 4737291

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<name>
<surname>Schinazi</surname>
<given-names>Victor R.</given-names>
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<sup>1</sup>
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<given-names>Daniel‐Robert</given-names>
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<sup>2</sup>
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<sup>1</sup>
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<named-content content-type="organisation-division">Department of Humanities, Social, and Political Sciences</named-content>
<institution>ETH Zürich</institution>
<named-content content-type="city">Zürich</named-content>
<country country="CH">Switzerland</country>
</aff>
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<label>
<sup>2</sup>
</label>
<named-content content-type="organisation-division">Department of Behavioral Sciences</named-content>
<institution>Ariel University</institution>
<named-content content-type="city">Ariel</named-content>
<country country="IL">Israel</country>
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<author-notes>
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<label>*</label>
Correspondence to:
<email>victor.schinazi@gess.ethz.ch</email>
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<fn id="wcs1375-note-0001">
<label></label>
<p>These authors contributed equally to this study.</p>
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<pub-date pub-type="epub">
<day>18</day>
<month>12</month>
<year>2015</year>
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<year>2016</year>
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<volume>7</volume>
<issue>1</issue>
<issue-id pub-id-type="doi">10.1002/wcs.2016.7.issue-1</issue-id>
<fpage>37</fpage>
<lpage>58</lpage>
<history>
<date date-type="received">
<day>20</day>
<month>6</month>
<year>2015</year>
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<date date-type="rev-recd">
<day>16</day>
<month>10</month>
<year>2015</year>
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<month>11</month>
<year>2015</year>
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<permissions>
<pmc-comment> © 2016 Wiley Periodicals, Inc. </pmc-comment>
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<abstract id="wcs1375-abs-0001">
<p id="wcs1375-para-0001">Spatial navigation in the absence of vision has been investigated from a variety of perspectives and disciplines. These different approaches have progressed our understanding of spatial knowledge acquisition by blind individuals, including their abilities, strategies, and corresponding mental representations. In this review, we propose a framework for investigating differences in spatial knowledge acquisition by blind and sighted people consisting of three longitudinal models (i.e., convergent, cumulative, and persistent). Recent advances in neuroscience and technological devices have provided novel insights into the different neural mechanisms underlying spatial navigation by blind and sighted people and the potential for functional reorganization. Despite these advances, there is still a lack of consensus regarding the extent to which locomotion and wayfinding depend on amodal spatial representations. This challenge largely stems from methodological limitations such as heterogeneity in the blind population and terminological ambiguity related to the concept of cognitive maps. Coupled with an over‐reliance on potential technological solutions, the field has diffused into theoretical and applied branches that do not always communicate. Here, we review research on navigation by congenitally blind individuals with an emphasis on behavioral and neuroscientific evidence, as well as the potential of technological assistance. Throughout the article, we emphasize the need to disentangle strategy choice and performance when discussing the navigation abilities of the blind population.
<italic>WIREs Cogn Sci</italic>
2016, 7:37–58. doi: 10.1002/wcs.1375</p>
<p>For further resources related to this article, please visit the
<ext-link ext-link-type="uri" xlink:href="http://wires.wiley.com/remdoi.cgi?doi=10.1002/wcs.1375">WIREs website</ext-link>
.</p>
</abstract>
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<notes>
<fn-group id="wcs1375-ntgp-0001">
<fn id="wcs1375-note-0002">
<p>Conflict of interest: The authors have declared no conflicts of interest for this article.This paper is dedicated to Roger Schinazi.</p>
</fn>
<fn id="wcs1375-note-0003">
<p>This paper is dedicated to Roger Schinazi.</p>
</fn>
</fn-group>
</notes>
</front>
<body>
<sec id="wcs1375-sec-0001">
<title>INTRODUCTION</title>
<p id="wcs1375-para-0002">Blind individuals are faced with the challenge of finding their way through built environments that can be difficult to interpret, disorienting, and even intimidating.
<xref rid="wcs1375-bib-0001" ref-type="ref">1</xref>
,
<xref rid="wcs1375-bib-0002" ref-type="ref">2</xref>
Research on visual impairment and blindness has approached this challenge by attempting to gain an understanding of the cognitive processes underlying navigation without vision and developing assistive technologies for obstacle avoidance and route selection. Despite the impressive number of technological advances (for reviews, see Refs
<xref rid="wcs1375-bib-0003" ref-type="ref">3</xref>
,
<xref rid="wcs1375-bib-0004" ref-type="ref">4</xref>
,
<xref rid="wcs1375-bib-0005" ref-type="ref">5</xref>
), these devices are not often used by the blind population.
<xref rid="wcs1375-bib-0006" ref-type="ref">6</xref>
At the same time, basic research in visual impairment has somewhat stagnated because of a failure to incorporate modern frameworks and recent findings from the field of spatial cognition. For example, traditional frameworks regarding the microgenesis of spatial knowledge
<xref rid="wcs1375-bib-0007" ref-type="ref">7</xref>
have resulted in inconsistent interpretations of survey knowledge (often termed ‘cognitive map’). This confusion has led to apparently contradictory results that have propagated through the field and, consequently, a lack of clarity regarding the navigation abilities of blind people.</p>
<p id="wcs1375-para-0003">We approach the topic from the perspective that blind and sighted people may have similar potential (i.e., abilities) for spatial learning that can support navigation. Our position is that, in order to investigate the abilities of blind individuals, researchers should study the relationship between navigation strategies (i.e., the implementation of particular action sequences
<xref rid="wcs1375-bib-0008" ref-type="ref">8</xref>
,
<xref rid="wcs1375-bib-0009" ref-type="ref">9</xref>
) and navigation performance (i.e., the extent to which a person is successful with respect to a particular navigation task) rather than approaching either factor independently.
<xref rid="wcs1375-bib-0010" ref-type="ref">10</xref>
Previous research that has studied both strategies and performance has typically constrained blind and sighted participants to adopt
<italic>similar</italic>
strategies. For example, this occurs when sighted participants are asked to wear blindfolds or when blind participants are asked to complete visually guided tasks (e.g., pointing judgments
<xref rid="wcs1375-bib-0011" ref-type="ref">11</xref>
). In such cases, a difference in performance is inconclusive with respect to abilities alone because the strategy adopted by both blind and sighted people invariably disadvantages one of the groups. These results are also inconclusive when researchers are unable to detect a difference in performance. Indeed, a nonsignificant difference does not necessarily provide evidence for the absence of an effect. In contrast, allowing participants to adopt
<italic>different</italic>
strategies would provide insight into the abilities of blind and sighted people. Here, similar performances would indicate similar abilities, and different performances would suggest different abilities (see Figure
<xref rid="wcs1375-fig-0001" ref-type="fig">1</xref>
). </p>
<fig fig-type="Figure" xml:lang="en" id="wcs1375-fig-0001" orientation="portrait" position="float">
<label>Figure 1</label>
<caption>
<p>Four possible outcomes of studying the interaction between spatial strategies and performances in spatial tasks. The two left cells lead to inconclusive or uninterpretable results with respect to the abilities of the blind and sighted. Future research should focus on the outcomes in the two right cells.</p>
</caption>
<graphic id="nlm-graphic-1" xlink:href="WCS-7-37-g001"></graphic>
</fig>
<p id="wcs1375-para-0004">In order to provide a comprehensive review on navigation and blindness, we limit ourselves to research on congenitally blind individuals. Previous research often separates the congenitally blind people from the adventitiously blind, blindfolded sighted, and sighted people. Comparisons across these groups are appropriate but difficult to implement because of lack of agreement regarding the distinction between congenitally and adventitiously blind individuals in terms of acuity, age of onset, and the presence or absence of additional disabilities.
<xref rid="wcs1375-bib-0012" ref-type="ref">12</xref>
,
<xref rid="wcs1375-bib-0013" ref-type="ref">13</xref>
,
<xref rid="wcs1375-bib-0014" ref-type="ref">14</xref>
,
<xref rid="wcs1375-bib-0015" ref-type="ref">15</xref>
In addition, blind groups are often at an advantage when compared to blindfolded sighted groups given their previous reliance on other perceptual modalities. Moreover, comparisons between blind and sighted groups can be problematic if the task inherently favors the visual modality. We will also focus our discussion on meso‐ and macroscale spaces (i.e., spaces that are larger than the observer and navigable
<xref rid="wcs1375-bib-0016" ref-type="ref">16</xref>
), but we will include empirical examples that use microscale spaces in order to infer navigation behavior.</p>
<p id="wcs1375-para-0005">This review is organized into six sections. First, we present behavioral research in human spatial navigation. Here, we discuss the concepts of locomotion and wayfinding, different frames of reference (e.g., egocentric or allocentric), and the affordances provided by different scales of space (e.g., micro, meso, or macro). Second, we discuss discrete and continuous frameworks for the acquisition of spatial knowledge. Third, we contrast different theories regarding the spatial abilities of blind people (i.e., difference, deficiency, and inefficiency
<xref rid="wcs1375-bib-0017" ref-type="ref">17</xref>
) as they relate to three possible models for the acquisition of spatial knowledge (i.e., convergent, cumulative, and persistent). Fourth, we discuss multimodal processing (i.e., obtained via various modalities) and amodal representations (i.e., independent of a specific modality
<xref rid="wcs1375-bib-0018" ref-type="ref">18</xref>
) such as what is often termed the ‘cognitive map.’ Fifth, we review the neural correlates of navigation by the blind population as they relate to functional reorganization in brain regions specifically associated with navigation. Sixth, we consider the future of research in navigation by blind people including a review of technological advances and heterogeneity in the blind population. At the end of this review, we intend to provide a framework for the interpretation of prior work and the facilitation of future work.</p>
</sec>
<sec id="wcs1375-sec-0002">
<title>HUMAN SPATIAL NAVIGATION</title>
<p id="wcs1375-para-0006">Everyday, blind individuals navigate indoor and outdoor environments that favor the visual sense. In order to reach a destination, they must plan and execute a series of decisions through these environments. Montello
<xref rid="wcs1375-bib-0019" ref-type="ref">19</xref>
distinguished between wayfinding and locomotion components of spatial decision‐making. This distinction corresponds to the terms ‘orientation’ and ‘mobility’ that are commonly used in the visual impairment literature.
<xref rid="wcs1375-bib-0020" ref-type="ref">20</xref>
Locomotion entails immediate responses to environmental features, such as avoiding a fire hydrant or stepping over a curb. These immediate responses are invariably egocentric because environmental information is acquired with reference to the observer's body.
<xref rid="wcs1375-bib-0021" ref-type="ref">21</xref>
In contrast, wayfinding involves reasoning about immediate
<xref rid="wcs1375-bib-0022" ref-type="ref">22</xref>
and remote
<xref rid="wcs1375-bib-0023" ref-type="ref">23</xref>
environments and can employ transient (i.e., short‐term) and enduring (i.e., long‐term) mental representations.
<xref rid="wcs1375-bib-0024" ref-type="ref">24</xref>
During wayfinding, people may also adopt reference frames other than those directly experienced (i.e., allocentric).</p>
<sec id="wcs1375-sec-0003">
<title>Reference Frames and Scales of Space</title>
<p id="wcs1375-para-0007">In wayfinding, egocentric and allocentric reference frames always involve at least one observer, two environmental features, and the spatial relations among them.
<xref rid="wcs1375-bib-0025" ref-type="ref">25</xref>
Unlike egocentric reference frames, allocentric reference frames are primarily comprised of object‐to‐object relations and/or an abstract coordinate system.
<xref rid="wcs1375-bib-0026" ref-type="ref">26</xref>
Various types of allocentric reference frames include environmental,
<xref rid="wcs1375-bib-0025" ref-type="ref">25</xref>
intrinsic,
<xref rid="wcs1375-bib-0027" ref-type="ref">27</xref>
and absolute.
<xref rid="wcs1375-bib-0028" ref-type="ref">28</xref>
For the remainder of this study, we will limit ourselves to the distinction between egocentric and allocentric reference frames (for a review, see Klatzky
<xref rid="wcs1375-bib-0029" ref-type="ref">29</xref>
). There is a tendency to associate blindness with egocentrism,
<xref rid="wcs1375-bib-0030" ref-type="ref">30</xref>
especially at larger scales,
<xref rid="wcs1375-bib-0031" ref-type="ref">31</xref>
but researchers have yet to disentangle whether or not egocentrism in the blind has resulted from aspects of experimental design.
<xref rid="wcs1375-bib-0010" ref-type="ref">10</xref>
For comparisons of blind and sighted individuals, more studies are needed in order to directly compare two types of task and/or performance criteria, one that favors egocentrism and one that favors allocentrism.</p>
<p id="wcs1375-para-0008">Both egocentric and allocentric references frames can be used to represent spaces of different scales. While several frameworks have been proposed,
<xref rid="wcs1375-bib-0022" ref-type="ref">22</xref>
,
<xref rid="wcs1375-bib-0032" ref-type="ref">32</xref>
we will use the typology described by Schinazi
<xref rid="wcs1375-bib-0016" ref-type="ref">16</xref>
specifically developed for the classification of experiments with blind and visually impaired individuals. This typology distinguishes between micro‐ (i.e., manipulatory space that does not require full‐body locomotion; see Box
<xref rid="wcs1375-fea-0001" ref-type="boxed-text">1</xref>
), meso‐ (i.e., space that is larger than the observer but can be apprehended from one viewpoint), and macroscales (i.e., space that is larger than the observer but must be apprehended from multiple viewpoints). Previous research has suggested particular associations between the scale of the environment and the adopted frame of reference (for a recent review, see Ref
<xref rid="wcs1375-bib-0033" ref-type="ref">33</xref>
), but the adoption of different reference frames may vary with respect to individual and task‐related factors (for a review, see Ref
<xref rid="wcs1375-bib-0034" ref-type="ref">34</xref>
). Similarly, scale of space influences choice of navigation strategy.
<xref rid="wcs1375-bib-0035" ref-type="ref">35</xref>
</p>
</sec>
</sec>
<sec disp-level="1">
<boxed-text position="float" content-type="BOX" id="wcs1375-fea-0001" orientation="portrait">
<label>BOX 1</label>
<caption>
<title>WHY CONSIDER THE MICROSCALE?</title>
</caption>
<sec id="wcs1375-sec-0004">
<p id="wcs1375-para-0009">Many experiments in the visual impairment and navigation literature involve either learning or testing in a microscale space. In some cases, participants are asked to learn a microscale environment from which macroscale behaviors can be inferred.
<xref rid="wcs1375-bib-0036" ref-type="ref">36</xref>
,
<xref rid="wcs1375-bib-0037" ref-type="ref">37</xref>
,
<xref rid="wcs1375-bib-0038" ref-type="ref">38</xref>
,
<xref rid="wcs1375-bib-0039" ref-type="ref">39</xref>
,
<xref rid="wcs1375-bib-0040" ref-type="ref">40</xref>
,
<xref rid="wcs1375-bib-0041" ref-type="ref">41</xref>
,
<xref rid="wcs1375-bib-0042" ref-type="ref">42</xref>
,
<xref rid="wcs1375-bib-0043" ref-type="ref">43</xref>
In other cases, participants are asked to learn a macroscale space and transfer this knowledge to a microscale task.
<xref rid="wcs1375-bib-0044" ref-type="ref">44</xref>
,
<xref rid="wcs1375-bib-0045" ref-type="ref">45</xref>
There are particular challenges and opportunities associated with each of these approaches.</p>
<p id="wcs1375-para-0010">On the one hand, small‐scale experiments
<xref rid="wcs1375-bib-0046" ref-type="ref">46</xref>
,
<xref rid="wcs1375-bib-0047" ref-type="ref">47</xref>
(e.g., table‐top tasks, tasks in fMRI) restrict participants’ locomotion and limit proprioceptive feedback.
<xref rid="wcs1375-bib-0048" ref-type="ref">48</xref>
In addition, these tasks cannot always dissociate egocentric and allocentric reference frames.
<xref rid="wcs1375-bib-0033" ref-type="ref">33</xref>
Given that navigation at the macroscale requires the coordination of multiple reference frames,
<xref rid="wcs1375-bib-0049" ref-type="ref">49</xref>
,
<xref rid="wcs1375-bib-0050" ref-type="ref">50</xref>
these behavioral and neural mechanisms may only be partly represented by studies at the smaller scales
<xref rid="wcs1375-bib-0033" ref-type="ref">33</xref>
.</p>
<p id="wcs1375-para-0011">On the other hand, microscale investigations provide a new level of explanation for macroscale behavior using neuroscientific evidence. For example, activation of the occipital lobe during tactile tasks have revealed similarities in the neural processes of blind people doing a tactile task and sighted people doing the same task visually.
<xref rid="wcs1375-bib-0051" ref-type="ref">51</xref>
,
<xref rid="wcs1375-bib-0052" ref-type="ref">52</xref>
,
<xref rid="wcs1375-bib-0053" ref-type="ref">53</xref>
,
<xref rid="wcs1375-bib-0054" ref-type="ref">54</xref>
Although only a subset of these mechanisms can be studied at the microscale,
<xref rid="wcs1375-bib-0033" ref-type="ref">33</xref>
greater experimental control is possible. Indeed, the systematic variation afforded by virtual reality may allow researchers to decompose different stages of navigation at the macroscale. Together, these considerations suggest that learning and testing at the microscale is necessary for navigation research with blind people, but researchers should be cautious when interpreting their results.</p>
</sec>
</boxed-text>
</sec>
<sec id="wcs1375-sec-0105">
<sec disp-level="2" id="wcs1375-sec-0005">
<title>Spatial Knowledge Acquisition</title>
<p id="wcs1375-para-0012">At the macroscale, researchers have proposed two frameworks for describing the acquisition of spatial knowledge. The discrete (also known as ‘dominant’
<xref rid="wcs1375-bib-0055" ref-type="ref">55</xref>
) framework posits that spatial knowledge is acquired via three, qualitatively distinct stages
<xref rid="wcs1375-bib-0007" ref-type="ref">7</xref>
(for an alternative discrete framework, see Ref
<xref rid="wcs1375-bib-0056" ref-type="ref">56</xref>
). During the first ‘landmark’ stage, people begin to learn salient features of the environment that can be used for establishing a frame of reference. During the second ‘route’ stage, landmarks become connected via routes that progress from topological to Euclidean formats. These routes allow for the construction of ‘mini‐maps’ that are locally, but not globally, coherent.
<xref rid="wcs1375-bib-0057" ref-type="ref">57</xref>
In the last ‘survey’ stage, people integrate these mini‐maps using an objective frame of reference. This global representation is sometimes referred to as a ‘cognitive map.’
<xref rid="wcs1375-bib-0058" ref-type="ref">58</xref>
Survey knowledge is often considered to be Euclidean in the sense that people can draw inferences regarding the straight‐line distance between two points. Along with Golledge
<xref rid="wcs1375-bib-0059" ref-type="ref">59</xref>
and Shemyakin,
<xref rid="wcs1375-bib-0060" ref-type="ref">60</xref>
Siegel and White's
<xref rid="wcs1375-bib-0007" ref-type="ref">7</xref>
framework was influenced by Piaget and Inhelder's
<xref rid="wcs1375-bib-0061" ref-type="ref">61</xref>
stage theory of cognitive development.</p>
<p id="wcs1375-para-0013">The alternative ‘continuous’ framework
<xref rid="wcs1375-bib-0055" ref-type="ref">55</xref>
differs from the discrete framework in at least two ways. First, the strict separation of landmark, route, and survey stages is criticized because people are capable of acquiring different types of spatial information in parallel.
<xref rid="wcs1375-bib-0062" ref-type="ref">62</xref>
,
<xref rid="wcs1375-bib-0063" ref-type="ref">63</xref>
,
<xref rid="wcs1375-bib-0064" ref-type="ref">64</xref>
Indeed, Schinazi and Epstein
<xref rid="wcs1375-bib-0064" ref-type="ref">64</xref>
found that, at decision points, landmarks and route information (i.e., direction of travel) were encoded simultaneously. Similarly, Ishikawa and Montello
<xref rid="wcs1375-bib-0065" ref-type="ref">65</xref>
found large individual differences with respect to the timing of survey knowledge acquisition. Second, Euclidean spatial knowledge is formed earlier in spatial learning than the discrete framework would suggest.
<xref rid="wcs1375-bib-0065" ref-type="ref">65</xref>
,
<xref rid="wcs1375-bib-0066" ref-type="ref">66</xref>
These findings support theories of Bayesian integration
<xref rid="wcs1375-bib-0067" ref-type="ref">67</xref>
and adaptive combination
<xref rid="wcs1375-bib-0068" ref-type="ref">68</xref>
of different sources of spatial information (e.g., place learning, response learning, cue learning, and dead reckoning). These theories posit that the reliability of spatial cues in the environment help determine the extent to which the corresponding information is acquired.</p>
</sec>
</sec>
<sec id="wcs1375-sec-0006">
<title>SPATIAL LEARNING BY BLIND PEOPLE</title>
<p id="wcs1375-para-0014">Similarly, the Convergent Active Processing in Interrelated Networks (CAPIN) theory has described the relative weighting of spatial information obtained through different perceptual modalities.
<xref rid="wcs1375-bib-0069" ref-type="ref">69</xref>
,
<xref rid="wcs1375-bib-0070" ref-type="ref">70</xref>
In this case, the weighting is determined by the reliability of the cues provided by each perceptual modality (e.g., the precision of the information specifying an object's location). Developed from studies with blind and sighted children, this model posits that, in the absence of vision, other modalities receive greater weight than they otherwise would have. Redundancy in the information received through the different specialized modalities allows individuals to compensate for lack of vision. During wayfinding, some of the information provided by vision, audition, and proprioception is redundant. Compared to the other modalities, vision provides relatively precise information regarding the location of specific features for allocentric encoding. As such, sighted individuals may attribute more weight to vision than to the other modalities. When sighted individuals are blindfolded, these weights will remain the same. Consequently, blindfolded sighted people may underperform relative to blind people, even for tasks that require allocentric encoding.
<xref rid="wcs1375-bib-0071" ref-type="ref">71</xref>
Blind individuals may be similarly capable of allocentric coding via audition and proprioception, but these modalities by themselves are, for the most part, insufficient. The effectiveness of auditory information is limited because not all meaningful features emit sounds, and the effectiveness of proprioceptive information may be limited because of physical barriers. However, the combination of audition and proprioception may facilitate the formation of an allocentric reference frame but at a different time scale (e.g., at the level of eye movements vs at the level of head rotations or walking).</p>
<p id="wcs1375-para-0015">Assuming redundancy in the spatial information provided by different modalities, the CAPIN theory would predict the amount of spatial knowledge acquired by blind and sighted individuals to eventually converge with experience. As such, the pattern predicted by the CAPIN theory represents one of three probable models (inspired by Chen
<xref rid="wcs1375-bib-0072" ref-type="ref">72</xref>
) for the progression of spatial knowledge acquisition by blind and sighted individuals (see Figure
<xref rid="wcs1375-fig-0002" ref-type="fig">2</xref>
). These models represent extensions of the difference, deficiency, and inefficiency theories proposed by Fletcher
<xref rid="wcs1375-bib-0017" ref-type="ref">17</xref>
that characterizes the history of research on the spatial abilities of blind people. Note that these models assume that vision provides sighted individuals with an initial advantage relative to blind individuals, but there have been a few cases in which the blind outperformed the sighted.
<xref rid="wcs1375-bib-0073" ref-type="ref">73</xref>
,
<xref rid="wcs1375-bib-0074" ref-type="ref">74</xref>
In addition, different models may apply to different spatial tasks. For a review of differences in memory and inferential tasks, see Ref
<xref rid="wcs1375-bib-0075" ref-type="ref">75</xref>
, and for a review of methods in spatial cognition and blindness, see Ref
<xref rid="wcs1375-bib-0076" ref-type="ref">76</xref>
. </p>
<fig fig-type="Figure" xml:lang="en" id="wcs1375-fig-0002" orientation="portrait" position="float">
<label>Figure 2</label>
<caption>
<p>Three models of differences in spatial knowledge acquisition between blind and sighted individuals. On the
<italic>x</italic>
‐axis is the amount of experience with a particular environment or task. On the
<italic>y</italic>
‐axis is the extent of spatial knowledge acquisition. Because of the lack of vision, blind individuals start at a disadvantage in each of these models. (a) Convergent model: the difference between blind and sighted individuals decreases over time until reaching a similar level of spatial knowledge. (b) Cumulative model: the difference between blind and sighted individuals increases with experience. (c) Persistent model: blind and sighted individuals continue to acquire spatial knowledge with experience, but differences in spatial knowledge remain constant.</p>
</caption>
<graphic id="nlm-graphic-3" xlink:href="WCS-7-37-g002"></graphic>
</fig>
<sec id="wcs1375-sec-0007">
<title>Convergent Model</title>
<p id="wcs1375-para-0016">Specifically, the difference/convergent model suggests that blind individuals begin at a disadvantage relative to sighted individuals but that this disparity decreases with experience until reaching similar levels of performance. Here, experience may refer to exposure to a particular environment, the repeated performance of a particular task, or the general development of spatial ability with age. This model is supported by several lines of research on tactile discrimination,
<xref rid="wcs1375-bib-0077" ref-type="ref">77</xref>
tactile matching,
<xref rid="wcs1375-bib-0078" ref-type="ref">78</xref>
assembly,
<xref rid="wcs1375-bib-0073" ref-type="ref">73</xref>
rotation tasks,
<xref rid="wcs1375-bib-0073" ref-type="ref">73</xref>
and distance estimation
<xref rid="wcs1375-bib-0073" ref-type="ref">73</xref>
,
<xref rid="wcs1375-bib-0079" ref-type="ref">79</xref>
at the microscale. Hollins and Kelley
<xref rid="wcs1375-bib-0080" ref-type="ref">80</xref>
also found that blind and sighted participants performed similarly in a spatial memory task (i.e., direction estimation) once blind participants were able to touch the task surface.
<xref rid="wcs1375-bib-0080" ref-type="ref">80</xref>
At the mesoscale, blind and sighted participants performed similarly at triangle completion tasks
<xref rid="wcs1375-bib-0081" ref-type="ref">81</xref>
,
<xref rid="wcs1375-bib-0082" ref-type="ref">82</xref>
,
<xref rid="wcs1375-bib-0083" ref-type="ref">83</xref>
and walking novel paths among objects in a room.
<xref rid="wcs1375-bib-0084" ref-type="ref">84</xref>
,
<xref rid="wcs1375-bib-0085" ref-type="ref">85</xref>
However, Millar
<xref rid="wcs1375-bib-0010" ref-type="ref">10</xref>
and Liben
<xref rid="wcs1375-bib-0086" ref-type="ref">86</xref>
note that the latter study does not necessarily provide evidence for a Euclidean representation given the curvature in the walked paths and possible auditory cues. In addition, Corazzini and colleagues.
<xref rid="wcs1375-bib-0087" ref-type="ref">87</xref>
found that blind participants exhibited larger learning effects than blindfolded sighted participants in the egocentric condition of an auditory version of a Morris water maze task. However, these results are difficult to interpret because performance in egocentric and allocentric conditions differed on the first trial before learning could have occurred. At the macroscale, research has shown that, although blind participants tend to plan routes in more detail (compared to sighted participants
<xref rid="wcs1375-bib-0088" ref-type="ref">88</xref>
), the accuracy with which models of environments were reconstructed was similar for blind and sighted groups.
<xref rid="wcs1375-bib-0088" ref-type="ref">88</xref>
,
<xref rid="wcs1375-bib-0089" ref-type="ref">89</xref>
Indeed, a recent study found that congenitally blind participants outperformed blindfolded sighted participants in terms of shortcutting, direction estimates, distance estimates, and sketch mapping after walking two routes.
<xref rid="wcs1375-bib-0071" ref-type="ref">71</xref>
</p>
</sec>
<sec id="wcs1375-sec-0008">
<title>Cumulative Model</title>
<p id="wcs1375-para-0017">The deficiency/cumulative model suggests that vision is critical for the development of spatial representation and that the progression of spatial knowledge acquisition is slower for blind people relative to sighted people. At its extreme, this model holds that, in the absence of vision, individuals are incapable of forming spatial representations.
<xref rid="wcs1375-bib-0090" ref-type="ref">90</xref>
According to a relatively moderate interpretation of this model, blind people may be able to acquire spatial knowledge, but the gap between blind and sighted individuals increases with experience. There is little evidence to support this view. For example, Cleaves and Royal
<xref rid="wcs1375-bib-0091" ref-type="ref">91</xref>
found that, for both memory and inferential tasks at the microscale, the disparity in performance between blind and sighted individuals increased with task complexity (i.e., finger mazes) and, for late blind individuals, the time since participants lost their vision. Similarly, at the meso‐ and macroscales, a longitudinal study found that blind children became less capable at estimating the straight‐line directions of different locations in their homes and neighborhoods. This disparity between blind and sighted children increased with the size of the environment under consideration.
<xref rid="wcs1375-bib-0092" ref-type="ref">92</xref>
</p>
</sec>
<sec id="wcs1375-sec-0009">
<title>Persistent Model</title>
<p id="wcs1375-para-0018">In the inefficiency/persistent model, the absence of vision results in an initial disadvantage that remains constant with experience because auditory and proprioceptive cues are less effective for spatial knowledge acquisition than vision. Although spatial knowledge can be acquired by blind people (significantly above chance performance), this knowledge may be less precise and/or less accurate compared to the knowledge of sighted people. Worchel
<xref rid="wcs1375-bib-0093" ref-type="ref">93</xref>
provided initial support for this theory using tasks that involves the reproduction and mental matching of geometric forms at the microscale and is often cited as evidence for inefficiency theory because the tasks favored the visual modality. However, upon careful examination, the results are more in line with the cumulative model given the superior performance of sighted participants and the significant relationship between age of onset and accuracy on spatial tasks.
<xref rid="wcs1375-bib-0093" ref-type="ref">93</xref>
It should also be noted that most of the evidence for this theory is based on differences in performance at one particular point in time but is assumed to be the same across time. Consequently, this approach cannot distinguish between the three aforementioned longitudinal models. As a result, the number of studies supporting this theory may be overestimated. At the microscale, the sighted consistently outperformed the blind in a haptic version of the triangle completion task,
<xref rid="wcs1375-bib-0094" ref-type="ref">94</xref>
mental scanning,
<xref rid="wcs1375-bib-0095" ref-type="ref">95</xref>
incidental cued‐recall test,
<xref rid="wcs1375-bib-0095" ref-type="ref">95</xref>
perspective‐taking,
<xref rid="wcs1375-bib-0096" ref-type="ref">96</xref>
mental rotation,
<xref rid="wcs1375-bib-0097" ref-type="ref">97</xref>
,
<xref rid="wcs1375-bib-0098" ref-type="ref">98</xref>
,
<xref rid="wcs1375-bib-0099" ref-type="ref">99</xref>
distance estimation,
<xref rid="wcs1375-bib-0074" ref-type="ref">74</xref>
direction estimation,
<xref rid="wcs1375-bib-0100" ref-type="ref">100</xref>
and change detection
<xref rid="wcs1375-bib-0075" ref-type="ref">75</xref>
after locomotion.
<xref rid="wcs1375-bib-0101" ref-type="ref">101</xref>
At the mesoscale, the performance of blind participants (relative to sighted participants) is sometimes lower for inferential tasks than memory tasks.
<xref rid="wcs1375-bib-0017" ref-type="ref">17</xref>
,
<xref rid="wcs1375-bib-0102" ref-type="ref">102</xref>
However, Rieser and colleagues
<xref rid="wcs1375-bib-0103" ref-type="ref">103</xref>
found that vision during locomotion can facilitate the completion of particular memory tasks when compared to an inferential task. Similarly, blind participants performed worse than sighted participants in Euclidean and/or functional (i.e., route) distance estimation,
<xref rid="wcs1375-bib-0104" ref-type="ref">104</xref>
,
<xref rid="wcs1375-bib-0105" ref-type="ref">105</xref>
direction estimation,
<xref rid="wcs1375-bib-0106" ref-type="ref">106</xref>
and a variety of other spatial tasks (e.g., short‐cutting, model construction
<xref rid="wcs1375-bib-0107" ref-type="ref">107</xref>
). For the most part, these patterns in performance are also present at the macroscale. Here, blind participants exhibited difficulties in terms of inferential direction tasks,
<xref rid="wcs1375-bib-0108" ref-type="ref">108</xref>
direction estimation from memory,
<xref rid="wcs1375-bib-0109" ref-type="ref">109</xref>
distance estimation,
<xref rid="wcs1375-bib-0110" ref-type="ref">110</xref>
model construction,
<xref rid="wcs1375-bib-0044" ref-type="ref">44</xref>
,
<xref rid="wcs1375-bib-0111" ref-type="ref">111</xref>
and sketch maps.
<xref rid="wcs1375-bib-0045" ref-type="ref">45</xref>
</p>
<p id="wcs1375-para-0019">Interestingly, there is less support for the persistent model than the convergent or cumulative models in the developmental literature (for a review, see Refs
<xref rid="wcs1375-bib-0014" ref-type="ref">14</xref>
,
<xref rid="wcs1375-bib-0112" ref-type="ref">112</xref>
). Several researchers have reported a pattern that resembles the cumulative model for Piagetian reasoning,
<xref rid="wcs1375-bib-0113" ref-type="ref">113</xref>
projective relations,
<xref rid="wcs1375-bib-0114" ref-type="ref">114</xref>
perspective‐taking,
<xref rid="wcs1375-bib-0115" ref-type="ref">115</xref>
and gross motor skills.
<xref rid="wcs1375-bib-0116" ref-type="ref">116</xref>
,
<xref rid="wcs1375-bib-0117" ref-type="ref">117</xref>
,
<xref rid="wcs1375-bib-0118" ref-type="ref">118</xref>
According to these studies, vision plays a critical role in the early stages of development,
<xref rid="wcs1375-bib-0119" ref-type="ref">119</xref>
but Millar
<xref rid="wcs1375-bib-0010" ref-type="ref">10</xref>
warns that lags in the Piagetian stages of development may indicate deficiencies in the discrete framework rather than deficiencies in the blind individuals’ abilities. Others have suggested that the natural course of development may eliminate performance gaps in terms of sensorimotor understanding and exploration of the environment.
<xref rid="wcs1375-bib-0120" ref-type="ref">120</xref>
Similarly, early interventions can reduce the gap in Piagetian reasoning.
<xref rid="wcs1375-bib-0121" ref-type="ref">121</xref>
Here, research indicates a convergent pattern as children's spatial thinking becomes more abstract.
<xref rid="wcs1375-bib-0120" ref-type="ref">120</xref>
</p>
</sec>
</sec>
<sec id="wcs1375-sec-0010">
<title>SPATIAL PROCESSING AND REPRESENTATION BY BLIND PEOPLE</title>
<p id="wcs1375-para-0020">The spatial representations underlying navigation performance can be abstracted from different perceptual modalities.
<xref rid="wcs1375-bib-0122" ref-type="ref">122</xref>
,
<xref rid="wcs1375-bib-0123" ref-type="ref">123</xref>
,
<xref rid="wcs1375-bib-0124" ref-type="ref">124</xref>
These modalities vary with respect to the amount of information that can be acquired simultaneously and sequentially.
<xref rid="wcs1375-bib-0125" ref-type="ref">125</xref>
Previous research has suggested that vision allows for simultaneous perception, whereas audition
<xref rid="wcs1375-bib-0126" ref-type="ref">126</xref>
and haptics
<xref rid="wcs1375-bib-0127" ref-type="ref">127</xref>
usually allow for sequential perception. Disadvantages of the blind during navigation have been attributed to this distinction between vision and the other modalities.
<xref rid="wcs1375-bib-0112" ref-type="ref">112</xref>
Indeed, a blind person with a cane can typically anticipate only one meter of spatial information per cane movement. However, the extent to which the information acquired by any modality is sequential or simultaneous depends on the spatial and temporal scales under consideration. As such, all of the perceptual modalities are sequential and simultaneous to some extent. Visual information, for example is distributed along time as well as space. The eyes tend to fixate one object at a time as they survey a scene,
<xref rid="wcs1375-bib-0128" ref-type="ref">128</xref>
and larger scenes require the integration of visual information over a longer period of time. The advantage of vision is thus the speed with which the eyes can move compared to head or body movements. While sensory substitution devices (SSDs) have improved the spatial and temporal resolution of available spatial information (e.g., the EyeCane
<xref rid="wcs1375-bib-0129" ref-type="ref">129</xref>
), this information still needs to be abstracted into an interpretable form (e.g., using artificial intelligence preprocessing
<xref rid="wcs1375-bib-0006" ref-type="ref">6</xref>
).</p>
<sec id="wcs1375-sec-0011">
<title>Multimodal Processing and Amodal Representations</title>
<p id="wcs1375-para-0021">Amodality posits that spatial representations can be abstracted from the perceptual modality through which the information was originally acquired.
<xref rid="wcs1375-bib-0018" ref-type="ref">18</xref>
,
<xref rid="wcs1375-bib-0130" ref-type="ref">130</xref>
Thus far, there are two types of evidence for this proposition. First, several researchers have attributed similarities in the performance of blind and sighted individuals (i.e., convergence) to amodal spatial representations.
<xref rid="wcs1375-bib-0079" ref-type="ref">79</xref>
Similar performance has been found for mental rotation tasks
<xref rid="wcs1375-bib-0097" ref-type="ref">97</xref>
,
<xref rid="wcs1375-bib-0098" ref-type="ref">98</xref>
,
<xref rid="wcs1375-bib-0099" ref-type="ref">99</xref>
(but see Klatzky
<xref rid="wcs1375-bib-0073" ref-type="ref">73</xref>
), mental scanning tasks,
<xref rid="wcs1375-bib-0074" ref-type="ref">74</xref>
,
<xref rid="wcs1375-bib-0095" ref-type="ref">95</xref>
incidental cued‐recall tasks,
<xref rid="wcs1375-bib-0095" ref-type="ref">95</xref>
Euclidean and functional distance estimation for regular street networks,
<xref rid="wcs1375-bib-0079" ref-type="ref">79</xref>
and triangle completion tasks.
<xref rid="wcs1375-bib-0083" ref-type="ref">83</xref>
Second, some researchers have investigated the functional equivalence of spatial information acquired through different perceptual modalities (for a review, see Refs
<xref rid="wcs1375-bib-0018" ref-type="ref">18</xref>
,
<xref rid="wcs1375-bib-0130" ref-type="ref">130</xref>
). Here, functional equivalence refers to similarities in performance resulting from information gained through two or more perceptual modalities (or language
<xref rid="wcs1375-bib-0131" ref-type="ref">131</xref>
,
<xref rid="wcs1375-bib-0132" ref-type="ref">132</xref>
). These studies have found functional equivalence of vision and language in direction and distance judgments,
<xref rid="wcs1375-bib-0133" ref-type="ref">133</xref>
vision and haptics in a spatial updating task,
<xref rid="wcs1375-bib-0134" ref-type="ref">134</xref>
audition and language in a walk‐to‐target task,
<xref rid="wcs1375-bib-0131" ref-type="ref">131</xref>
and vision and audition in a spatial working memory task.
<xref rid="wcs1375-bib-0135" ref-type="ref">135</xref>
In addition, to confirm or disconfirm the primary role of vision, some of these experiments have used blind participants in addition to the blindfolded sighted or sighted participants.
<xref rid="wcs1375-bib-0131" ref-type="ref">131</xref>
,
<xref rid="wcs1375-bib-0134" ref-type="ref">134</xref>
</p>
<p id="wcs1375-para-0022">Despite these efforts, amodality remains an open issue in the literature because of the difficulty in disentangling representation and process using behavioral data.
<xref rid="wcs1375-bib-0136" ref-type="ref">136</xref>
Any hypothesis regarding the format of a representation underlying behavior must assume (either implicitly or explicitly) particular processes and vice versa.
<xref rid="wcs1375-bib-0136" ref-type="ref">136</xref>
As such, the CAPIN model assumes that amodal representations underlie spatial behavior in order to support the hypothesis that spatial information can be acquired through multiple modalities.
<xref rid="wcs1375-bib-0069" ref-type="ref">69</xref>
However, multimodal processing may also be paired with modality‐specific representations to form an alternative theory. Similarly, amodal representation may be paired with modality‐specific processing.
<xref rid="wcs1375-bib-0018" ref-type="ref">18</xref>
,
<xref rid="wcs1375-bib-0130" ref-type="ref">130</xref>
In order to provide evidence for or against amodal representation, we propose an approach using Bayesian models of integration.
<xref rid="wcs1375-bib-0067" ref-type="ref">67</xref>
Here, for a navigation task, one would systematically vary the reliability of location cues from two different modalities (e.g., vision and audition) and the distance between the indicated locations. These two sets of parameters can be used in order to calculate the optimal localization response (according to the Bayesian model) from trial to trial. On the one hand, significant deviations from this optimal response would indicate evidence against amodality. Such deviations may result from either a failure to integrate the two cues or a disparity between the objective cues and the perceived cues. This disparity may be used in order to match cues from different modalities (e.g., vision and audition) in terms of perceived information content (e.g., distal access). At the same time, this possibility can be eliminated by also obtaining responses to the two cues individually (as recommended by Cheng et al.
<xref rid="wcs1375-bib-0067" ref-type="ref">67</xref>
). On the other hand, the extent to which the Bayesian model can predict localization responses would indicate evidence towards amodality.</p>
</sec>
<sec id="wcs1375-sec-0012">
<title>Cognitive Maps</title>
<p id="wcs1375-para-0023">The amodal representations underlying navigation are often referred to as ‘cognitive maps.’ Psychologist Edward Tolman
<xref rid="wcs1375-bib-0137" ref-type="ref">137</xref>
coined the term ‘cognitive map’ in 1948 in order to describe the neural mapping of stimuli to responses. Although he investigated the spatial behavior of ‘hungry’ rats in a variety of mazes, he intended the term to be used more broadly.
<xref rid="wcs1375-bib-0138" ref-type="ref">138</xref>
This is evident in his discussion of such topics as motivation during development and race relations. Over two decades later, O'Keefe and Dostrovsky
<xref rid="wcs1375-bib-0139" ref-type="ref">139</xref>
referred to Tolman in order to define their discovery of ‘a cognitive, or spatial, map of [a rat's] environment’ (p. 171). In the introduction to
<italic>The Hippocampus as a Cognitive Map</italic>
, O'Keefe and Nadel
<xref rid="wcs1375-bib-0140" ref-type="ref">140</xref>
later revised this reference to Tolman by acknowledging that the original definition of cognitive map was too vague for their purposes. According to their new definition, cognitive maps were psychological spaces with absolute reference frames.
<xref rid="wcs1375-bib-0141" ref-type="ref">141</xref>
</p>
<p id="wcs1375-para-0024">The current challenge with cognitive maps stems from the vague definitions of the term,
<xref rid="wcs1375-bib-0142" ref-type="ref">142</xref>
its constant reformulation,
<xref rid="wcs1375-bib-0143" ref-type="ref">143</xref>
,
<xref rid="wcs1375-bib-0144" ref-type="ref">144</xref>
and inaccurate citations of Tolman's and O'Keefe's previous work. At its most extreme, cognitive maps are considered structurally analogous to a cartographic map
<xref rid="wcs1375-bib-0145" ref-type="ref">145</xref>
in that they represent Euclidean spatial relations in a global format, from a top–down view, and with an allocentric frame of reference.
<xref rid="wcs1375-bib-0146" ref-type="ref">146</xref>
,
<xref rid="wcs1375-bib-0147" ref-type="ref">147</xref>
While most researchers acknowledge that the cartographic map is only a yardstick for comparison,
<xref rid="wcs1375-bib-0138" ref-type="ref">138</xref>
at least five issues regarding cognitive maps remain. Cognitive maps may be defined with respect to level of abstraction (e.g., amodal vs modality‐specific
<xref rid="wcs1375-bib-0148" ref-type="ref">148</xref>
), scope (e.g., global vs local
<xref rid="wcs1375-bib-0058" ref-type="ref">58</xref>
), metricality (e.g., Euclidean vs topological
<xref rid="wcs1375-bib-0149" ref-type="ref">149</xref>
,
<xref rid="wcs1375-bib-0150" ref-type="ref">150</xref>
), perspective (e.g., orientation free, top‐down, or first‐person
<xref rid="wcs1375-bib-0151" ref-type="ref">151</xref>
,
<xref rid="wcs1375-bib-0152" ref-type="ref">152</xref>
), and reference frame (e.g., egocentric vs allocentric, absolute vs relative
<xref rid="wcs1375-bib-0153" ref-type="ref">153</xref>
). Consequently, different researchers have employed different tasks in order to investigate cognitive maps.
<xref rid="wcs1375-bib-0076" ref-type="ref">76</xref>
An additional source of confusion is the nesting of these various terms. For example, reference frames can include a perspective, but a perspective does not necessarily assume a particular reference frame.</p>
<p id="wcs1375-para-0025">With respect to research on the blind population, the term cognitive map continues to be loosely applied. There are many important findings regarding the content (i.e., the amount of acquired spatial knowledge) and quality (i.e., its character or format) of blind individuals’ spatial representations (see
<italic>Spatial Learning by Blind People</italic>
section). However, separate aspects of the term are conflated in discussions of whether blind people have cognitive maps. For example, researchers may use both route knowledge techniques (e.g., distance and direction estimates) and survey techniques (e.g., sketch maps) in order to probe ‘cognitive map knowledge.’
<xref rid="wcs1375-bib-0044" ref-type="ref">44</xref>
,
<xref rid="wcs1375-bib-0076" ref-type="ref">76</xref>
,
<xref rid="wcs1375-bib-0088" ref-type="ref">88</xref>
,
<xref rid="wcs1375-bib-0106" ref-type="ref">106</xref>
,
<xref rid="wcs1375-bib-0107" ref-type="ref">107</xref>
,
<xref rid="wcs1375-bib-0109" ref-type="ref">109</xref>
,
<xref rid="wcs1375-bib-0154" ref-type="ref">154</xref>
Performances on these tasks may appear to provide overwhelming evidence for cognitive maps in blind people. However, this inconsistency in the operationalization of the term may also represent a variety of specific spatial abilities. Thus, we recommend the use of relatively well‐defined terms (e.g., metricality and reference frame) when investigating the content and quality of spatial representations in the absence of vision.</p>
</sec>
</sec>
<sec id="wcs1375-sec-0013">
<title>NEURAL CORRELATES OF HUMAN NAVIGATION</title>
<p id="wcs1375-para-0026">In order to further investigate the process of cognitive mapping, researchers have also employed neuroscientific methods. Research with animals has found that the medial temporal lobe is critical for the allocentric spatial representations (often referred to as cognitive maps) that underlie navigation.
<xref rid="wcs1375-bib-0140" ref-type="ref">140</xref>
In particular, grid cells
<xref rid="wcs1375-bib-0155" ref-type="ref">155</xref>
in the medial entorhinal cortex provide place cells
<xref rid="wcs1375-bib-0139" ref-type="ref">139</xref>
primarily in the hippocampus (but see Whitlock
<xref rid="wcs1375-bib-0156" ref-type="ref">156</xref>
for the parahippocampus and parietal cortex) with the coordinate system required for location‐specific encoding.
<xref rid="wcs1375-bib-0157" ref-type="ref">157</xref>
Similarly, research using cell recordings in humans has identified place cells
<xref rid="wcs1375-bib-0158" ref-type="ref">158</xref>
and grid cells.
<xref rid="wcs1375-bib-0159" ref-type="ref">159</xref>
Consistent with an allocentric representation system, neuroimaging studies have found correlations between hippocampal activity and Euclidean distances between presented locations (specifically in the left anterior region
<xref rid="wcs1375-bib-0160" ref-type="ref">160</xref>
), directional responses during an initial learning phase,
<xref rid="wcs1375-bib-0161" ref-type="ref">161</xref>
mental
<xref rid="wcs1375-bib-0162" ref-type="ref">162</xref>
or virtual
<xref rid="wcs1375-bib-0163" ref-type="ref">163</xref>
navigation along a known route between landmarks, and triangle completion.
<xref rid="wcs1375-bib-0164" ref-type="ref">164</xref>
In addition, differences in the volume of the posterior hippocampus have been related to navigation expertise
<xref rid="wcs1375-bib-0165" ref-type="ref">165</xref>
and training
<xref rid="wcs1375-bib-0166" ref-type="ref">166</xref>
in taxi drivers and inferential pointing judgments by college students.
<xref rid="wcs1375-bib-0066" ref-type="ref">66</xref>
Lesion studies further confirm the role of the hippocampus for encoding locations in an allocentric reference frame.
<xref rid="wcs1375-bib-0167" ref-type="ref">167</xref>
,
<xref rid="wcs1375-bib-0168" ref-type="ref">168</xref>
,
<xref rid="wcs1375-bib-0169" ref-type="ref">169</xref>
Several studies have dissociated this allocentric system in the medial temporal lobe with a response‐based system centered in the caudate nucleus in both animals
<xref rid="wcs1375-bib-0170" ref-type="ref">170</xref>
and humans
<xref rid="wcs1375-bib-0171" ref-type="ref">171</xref>
,
<xref rid="wcs1375-bib-0172" ref-type="ref">172</xref>
,
<xref rid="wcs1375-bib-0173" ref-type="ref">173</xref>
(for reviews see Refs
<xref rid="wcs1375-bib-0174" ref-type="ref">174</xref>
,
<xref rid="wcs1375-bib-0175" ref-type="ref">175</xref>
,
<xref rid="wcs1375-bib-0176" ref-type="ref">176</xref>
). A response‐based system encodes procedural knowledge such as specific action sequences during navigation.
<xref rid="wcs1375-bib-0170" ref-type="ref">170</xref>
</p>
<p id="wcs1375-para-0027">Also supporting human spatial navigation is a scene‐processing network centered around the parahippocampal place area (PPA
<xref rid="wcs1375-bib-0177" ref-type="ref">177</xref>
) and retrosplenial cortex (RSC).
<xref rid="wcs1375-bib-0178" ref-type="ref">178</xref>
Both the PPA and RSC respond preferentially to scenes when compared to objects or faces.
<xref rid="wcs1375-bib-0177" ref-type="ref">177</xref>
In particular, the PPA is responsible for encoding the spatial structure of the local scene (for a review, see Ref
<xref rid="wcs1375-bib-0179" ref-type="ref">179</xref>
). The PPA is particularly responsive to landmarks at decisions points (i.e., those that are relevant for navigation
<xref rid="wcs1375-bib-0064" ref-type="ref">64</xref>
), and the parahippocampal gyrus more generally can discriminate between large and small objects.
<xref rid="wcs1375-bib-0180" ref-type="ref">180</xref>
In contrast, the RSC is responsible for situating the local scene within the broader spatial environment (for a review, see Ref
<xref rid="wcs1375-bib-0179" ref-type="ref">179</xref>
). In particular, the RSC integrates egocentric spatial information and may have a role in translating that information into an allocentric code.
<xref rid="wcs1375-bib-0161" ref-type="ref">161</xref>
Such information includes the direction of travel at decision points
<xref rid="wcs1375-bib-0064" ref-type="ref">64</xref>
and, more precisely, the observer's position and heading
<xref rid="wcs1375-bib-0181" ref-type="ref">181</xref>
analogous to head direction cells in rats.
<xref rid="wcs1375-bib-0182" ref-type="ref">182</xref>
</p>
<sec id="wcs1375-sec-0014">
<title>Neural Correlates of Navigation by Blind People</title>
<p id="wcs1375-para-0028">Despite the advances in neuroscience research on navigation by sighted individuals, this work has been difficult to extend to blind individuals, especially for meso‐ and macroscale environments. Some researchers have opted to conduct the experimental task outside the MRI scanner and analyze the relationship between the structural image and task performance.
<xref rid="wcs1375-bib-0183" ref-type="ref">183</xref>
Others have attempted to circumvent this challenge by employing tactile (e.g., finger mazes
<xref rid="wcs1375-bib-0046" ref-type="ref">46</xref>
and shape recognition
<xref rid="wcs1375-bib-0184" ref-type="ref">184</xref>
,
<xref rid="wcs1375-bib-0185" ref-type="ref">185</xref>
) or auditory tasks.
<xref rid="wcs1375-bib-0186" ref-type="ref">186</xref>
However, tactile tasks sometimes require movement beyond the typical button responses that can cause artifacts in the functional imaging data without appropriate control conditions.
<xref rid="wcs1375-bib-0046" ref-type="ref">46</xref>
Furthermore, auditory tasks have focused on spatial abilities that do not necessarily correspond to those used during navigation (e.g., sound localization without locomotion
<xref rid="wcs1375-bib-0187" ref-type="ref">187</xref>
). In addition, researchers have rarely allowed both blind and sighted participants to use their dominant modality in learning or testing within the same experiment (see discussion of the relationship between strategy, performance, and ability in the Introduction).</p>
<p id="wcs1375-para-0029">Studies in which blind participants used either auditory or tactile modalities have highlighted their brains’ capacity for both intramodal (e.g., changes in functional areas resulting from visual deprivation corresponding to the same modality) and cross‐modal (e.g., changes in functional areas resulting from visual deprivation corresponding to a different modality) plasticity
<xref rid="wcs1375-bib-0188" ref-type="ref">188</xref>
,
<xref rid="wcs1375-bib-0189" ref-type="ref">189</xref>
although these two phenomena are not mutually exclusive.
<xref rid="wcs1375-bib-0190" ref-type="ref">190</xref>
Indeed, the occipital cortex (including the associative areas) can be recruited during both auditory
<xref rid="wcs1375-bib-0191" ref-type="ref">191</xref>
,
<xref rid="wcs1375-bib-0192" ref-type="ref">192</xref>
and tactile
<xref rid="wcs1375-bib-0051" ref-type="ref">51</xref>
,
<xref rid="wcs1375-bib-0052" ref-type="ref">52</xref>
,
<xref rid="wcs1375-bib-0193" ref-type="ref">193</xref>
tasks (for reviews, see Refs
<xref rid="wcs1375-bib-0194" ref-type="ref">194</xref>
,
<xref rid="wcs1375-bib-0195" ref-type="ref">195</xref>
). In addition, structural imaging studies have found reduced volume in the occipital cortex for blind participants relative to sighted participants
<xref rid="wcs1375-bib-0196" ref-type="ref">196</xref>
,
<xref rid="wcs1375-bib-0197" ref-type="ref">197</xref>
(for a review, see Ref
<xref rid="wcs1375-bib-0198" ref-type="ref">198</xref>
). A deformation‐based morphometry study also found that, while the early occipital cortex is reduced for blind individuals compared to sighted individuals, the associative occipital cortex is relatively large.
<xref rid="wcs1375-bib-0199" ref-type="ref">199</xref>
Although the role of the occipital cortex is different for blind and sighted individuals in general, less is known about structural and functional differences in other areas that support navigation.</p>
<p id="wcs1375-para-0030">Analogous to studies with sighted people, research into the neural correlates of navigation by blind people have investigated allocentric, response‐based, and scene‐processing networks (see Figure
<xref rid="wcs1375-fig-0003" ref-type="fig">3</xref>
). With respect to the allocentric network centered in the hippocampus, volumetric studies found that blind people have smaller right posterior hippocampi
<xref rid="wcs1375-bib-0200" ref-type="ref">200</xref>
,
<xref rid="wcs1375-bib-0201" ref-type="ref">201</xref>
and larger right anterior hippocampi
<xref rid="wcs1375-bib-0183" ref-type="ref">183</xref>
,
<xref rid="wcs1375-bib-0201" ref-type="ref">201</xref>
relative to sighted people. Fortin and colleagues
<xref rid="wcs1375-bib-0183" ref-type="ref">183</xref>
also found that the size of the right hippocampus was correlated with performance on a wayfinding task in a maze. The hippocampus has also been implicated for navigation through a tactile finger maze
<xref rid="wcs1375-bib-0046" ref-type="ref">46</xref>
and an Euclidean distance task (comparable to Morgan
<xref rid="wcs1375-bib-0160" ref-type="ref">160</xref>
) using auditory cues.
<xref rid="wcs1375-bib-0186" ref-type="ref">186</xref>
These studies may appear to provide evidence for allocentrism in blind individuals. However, it should be noted that two of these studies
<xref rid="wcs1375-bib-0200" ref-type="ref">200</xref>
,
<xref rid="wcs1375-bib-0201" ref-type="ref">201</xref>
did not associate hippocampal volume with a navigation task
<xref rid="wcs1375-bib-0064" ref-type="ref">64</xref>
or expertise.
<xref rid="wcs1375-bib-0165" ref-type="ref">165</xref>
,
<xref rid="wcs1375-bib-0166" ref-type="ref">166</xref>
In addition, the correlation between hippocampal size and performance found by Fortin and colleagues
<xref rid="wcs1375-bib-0183" ref-type="ref">183</xref>
is based on data aggregated over blind and sighted participants for a task that did not necessarily require an allocentric reference frame. Furthermore, the imaging data from Gagnon and colleagues
<xref rid="wcs1375-bib-0046" ref-type="ref">46</xref>
contrasted maze navigation with rest instead of a control task that could have disentangled the effect of navigation from that of general task completion. Interestingly, to date, no studies have found activation of or volumetric differences in the caudate related to a response‐based navigation system by blind people.
<xref rid="wcs1375-bib-0202" ref-type="ref">202</xref>
Several studies have also implicated the scene‐processing network centered around the PPA and RSC for the haptic exploration of scenes (compared to objects
<xref rid="wcs1375-bib-0184" ref-type="ref">184</xref>
) and the discrimination of object sizes.
<xref rid="wcs1375-bib-0185" ref-type="ref">185</xref>
These findings help to frame other investigations that have found activation in the parahippocampal gyrus for a tactile finger maze task
<xref rid="wcs1375-bib-0046" ref-type="ref">46</xref>
and navigation through a virtual environment with the aid of an SSD.
<xref rid="wcs1375-bib-0047" ref-type="ref">47</xref>
</p>
<fig fig-type="Figure" xml:lang="en" id="wcs1375-fig-0003" orientation="portrait" position="float">
<label>Figure 3</label>
<caption>
<p>A schematic depiction of the neural correlates (i.e., functional and structural) of navigation by the blind. Indicators are organized by study and task. The color of each indicator represents study, and the shape represents type of task. Indicators are placed over the approximate regions corresponding to each study.</p>
</caption>
<graphic id="nlm-graphic-5" xlink:href="WCS-7-37-g003"></graphic>
</fig>
<p id="wcs1375-para-0031">Previous research has also identified a variety of other brain regions (e.g., parietal and occipital cortices) that were active during navigation tasks by blind people (see Figure
<xref rid="wcs1375-fig-0003" ref-type="fig">3</xref>
). Specifically, the right inferior parietal cortex was active during an Euclidean distance task using auditory cues,
<xref rid="wcs1375-bib-0186" ref-type="ref">186</xref>
and the posterior parietal cortex was active during navigation through a virtual environment using a SSD.
<xref rid="wcs1375-bib-0047" ref-type="ref">47</xref>
In addition, the occipital cortex was active during haptic
<xref rid="wcs1375-bib-0047" ref-type="ref">47</xref>
(uncorrected
<xref rid="wcs1375-bib-0046" ref-type="ref">46</xref>
) and imagined
<xref rid="wcs1375-bib-0203" ref-type="ref">203</xref>
navigation. Other areas may be related to navigation by blind people, but more research is needed before these can be tied to specific spatial knowledge constructs (precuneus and fusiform gyrus
<xref rid="wcs1375-bib-0047" ref-type="ref">47</xref>
; temporal parietal junction
<xref rid="wcs1375-bib-0204" ref-type="ref">204</xref>
; and superior temporal gyrus
<xref rid="wcs1375-bib-0205" ref-type="ref">205</xref>
). The recruitment of these areas by different modalities (e.g., auditory and tactile) may suggest the functional reorganization of cortical areas in order to support navigation.
<xref rid="wcs1375-bib-0047" ref-type="ref">47</xref>
This is consistent with results from Wolbers and colleagues
<xref rid="wcs1375-bib-0184" ref-type="ref">184</xref>
in which functional connectivity analysis indicated lack of significant connections between the occipital and posterior parahippocampus for the haptic discrimination task. Taken together, these results may support theories of amodal spatial representation (rather than visual recoding) in blind participants’ brains.</p>
</sec>
</sec>
<sec id="wcs1375-sec-0015">
<title>FUTURE CONSIDERATIONS</title>
<sec id="wcs1375-sec-0016">
<title>Technological Advances for Navigation Assistance</title>
<p id="wcs1375-para-0032">There are three different technological approaches to navigation assistance for blind people. First, noninvasive technologies including SSDs exploit the brain's natural ability to adapt in response to the environment.
<xref rid="wcs1375-bib-0188" ref-type="ref">188</xref>
,
<xref rid="wcs1375-bib-0206" ref-type="ref">206</xref>
Second, invasive technologies directly stimulate regions of the visual system with the aid of a prosthesis in order to bypass damaged areas.
<xref rid="wcs1375-bib-0207" ref-type="ref">207</xref>
,
<xref rid="wcs1375-bib-0208" ref-type="ref">208</xref>
,
<xref rid="wcs1375-bib-0209" ref-type="ref">209</xref>
,
<xref rid="wcs1375-bib-0210" ref-type="ref">210</xref>
,
<xref rid="wcs1375-bib-0211" ref-type="ref">211</xref>
,
<xref rid="wcs1375-bib-0212" ref-type="ref">212</xref>
In these two cases, the technologies attempt to bypass the missing sense in order to complement the user's existing sources of spatial information. Unlike SSDs, invasive technologies are not targeted towards congenitally blind people but are found to be effective for adventitiously blind people given that these devices require a developed visual system and/or prior visual experience.
<xref rid="wcs1375-bib-0213" ref-type="ref">213</xref>
Indeed, studies using transcranial magnetic stimulation (TMS) in the visual cortex have demonstrated that elicited vision‐like sensations (i.e., phosphenes) increase with remaining visual acuity in adventitiously blind participants
<xref rid="wcs1375-bib-0214" ref-type="ref">214</xref>
and may not occur for congenitally blind participants.
<xref rid="wcs1375-bib-0198" ref-type="ref">198</xref>
Furthermore, Garcia and colleagues
<xref rid="wcs1375-bib-0215" ref-type="ref">215</xref>
found that a retinal prosthesis did not provide sufficiently coherent or precise information for navigation. Third, general navigation aids can provide abstracted spatial information to the user using one of his/her functioning senses (e.g., GPS devices). Unlike SSDs and invasive technologies, these general aids can potentially be used by people with or without vision. Despite the large number of conceptual papers on this topic,
<xref rid="wcs1375-bib-0216" ref-type="ref">216</xref>
,
<xref rid="wcs1375-bib-0217" ref-type="ref">217</xref>
,
<xref rid="wcs1375-bib-0218" ref-type="ref">218</xref>
,
<xref rid="wcs1375-bib-0219" ref-type="ref">219</xref>
,
<xref rid="wcs1375-bib-0220" ref-type="ref">220</xref>
,
<xref rid="wcs1375-bib-0221" ref-type="ref">221</xref>
,
<xref rid="wcs1375-bib-0222" ref-type="ref">222</xref>
,
<xref rid="wcs1375-bib-0223" ref-type="ref">223</xref>
,
<xref rid="wcs1375-bib-0224" ref-type="ref">224</xref>
,
<xref rid="wcs1375-bib-0225" ref-type="ref">225</xref>
we will focus our discussion on the few examples of SSDs that have been empirically tested in the context of navigation. For more comprehensive reviews of technological navigation aids and SSDs, see Refs
<xref rid="wcs1375-bib-0004" ref-type="ref">4</xref>
,
<xref rid="wcs1375-bib-0005" ref-type="ref">5</xref>
, and
<xref rid="wcs1375-bib-0226" ref-type="ref">226</xref>
.</p>
<p id="wcs1375-para-0033">SSDs translate visual information into tactile information, auditory information, or both in a noninvasive manner.
<xref rid="wcs1375-bib-0003" ref-type="ref">3</xref>
,
<xref rid="wcs1375-bib-0005" ref-type="ref">5</xref>
,
<xref rid="wcs1375-bib-0227" ref-type="ref">227</xref>
,
<xref rid="wcs1375-bib-0228" ref-type="ref">228</xref>
These devices have been available for several decades, but they have not been widely adopted by the blind population
<xref rid="wcs1375-bib-0006" ref-type="ref">6</xref>
,
<xref rid="wcs1375-bib-0229" ref-type="ref">229</xref>
,
<xref rid="wcs1375-bib-0230" ref-type="ref">230</xref>
(but see Ref
<xref rid="wcs1375-bib-0231" ref-type="ref">231</xref>
). Recently, researchers have investigated the potential of these technologies for navigation by blind people.
<xref rid="wcs1375-bib-0047" ref-type="ref">47</xref>
,
<xref rid="wcs1375-bib-0129" ref-type="ref">129</xref>
,
<xref rid="wcs1375-bib-0232" ref-type="ref">232</xref>
,
<xref rid="wcs1375-bib-0233" ref-type="ref">233</xref>
,
<xref rid="wcs1375-bib-0234" ref-type="ref">234</xref>
At the same time, evidence from neuroscience regarding the brain's capacity for functional reorganization
<xref rid="wcs1375-bib-0047" ref-type="ref">47</xref>
,
<xref rid="wcs1375-bib-0054" ref-type="ref">54</xref>
,
<xref rid="wcs1375-bib-0184" ref-type="ref">184</xref>
,
<xref rid="wcs1375-bib-0235" ref-type="ref">235</xref>
suggests flexibility with respect to the channels through which perceptual information can be processed. Indeed, congenitally blind participants using SSDs recruit visual areas to recognize sounds, shapes, and movement
<xref rid="wcs1375-bib-0187" ref-type="ref">187</xref>
,
<xref rid="wcs1375-bib-0236" ref-type="ref">236</xref>
(see
<italic>Neural Correlates of Navigation by Blind People</italic>
section). This is consistent with the view that the brain considers information in a task‐dependent, rather than a modality‐dependent, manner.
<xref rid="wcs1375-bib-0206" ref-type="ref">206</xref>
</p>
<p id="wcs1375-para-0034">Since 2000, many researchers have investigated the use of SSDs for locomotion and wayfinding assistance in indoor and outdoor, real and virtual, environments using auditory and tactile feedback.
<xref rid="wcs1375-bib-0233" ref-type="ref">233</xref>
,
<xref rid="wcs1375-bib-0234" ref-type="ref">234</xref>
,
<xref rid="wcs1375-bib-0237" ref-type="ref">237</xref>
,
<xref rid="wcs1375-bib-0238" ref-type="ref">238</xref>
,
<xref rid="wcs1375-bib-0239" ref-type="ref">239</xref>
,
<xref rid="wcs1375-bib-0240" ref-type="ref">240</xref>
,
<xref rid="wcs1375-bib-0241" ref-type="ref">241</xref>
,
<xref rid="wcs1375-bib-0242" ref-type="ref">242</xref>
,
<xref rid="wcs1375-bib-0243" ref-type="ref">243</xref>
,
<xref rid="wcs1375-bib-0244" ref-type="ref">244</xref>
,
<xref rid="wcs1375-bib-0245" ref-type="ref">245</xref>
,
<xref rid="wcs1375-bib-0246" ref-type="ref">246</xref>
,
<xref rid="wcs1375-bib-0247" ref-type="ref">247</xref>
,
<xref rid="wcs1375-bib-0248" ref-type="ref">248</xref>
,
<xref rid="wcs1375-bib-0249" ref-type="ref">249</xref>
,
<xref rid="wcs1375-bib-0250" ref-type="ref">250</xref>
,
<xref rid="wcs1375-bib-0251" ref-type="ref">251</xref>
,
<xref rid="wcs1375-bib-0252" ref-type="ref">252</xref>
,
<xref rid="wcs1375-bib-0253" ref-type="ref">253</xref>
,
<xref rid="wcs1375-bib-0254" ref-type="ref">254</xref>
,
<xref rid="wcs1375-bib-0255" ref-type="ref">255</xref>
,
<xref rid="wcs1375-bib-0256" ref-type="ref">256</xref>
,
<xref rid="wcs1375-bib-0257" ref-type="ref">257</xref>
,
<xref rid="wcs1375-bib-0258" ref-type="ref">258</xref>
,
<xref rid="wcs1375-bib-0259" ref-type="ref">259</xref>
,
<xref rid="wcs1375-bib-0260" ref-type="ref">260</xref>
,
<xref rid="wcs1375-bib-0261" ref-type="ref">261</xref>
,
<xref rid="wcs1375-bib-0262" ref-type="ref">262</xref>
,
<xref rid="wcs1375-bib-0263" ref-type="ref">263</xref>
,
<xref rid="wcs1375-bib-0264" ref-type="ref">264</xref>
,
<xref rid="wcs1375-bib-0265" ref-type="ref">265</xref>
,
<xref rid="wcs1375-bib-0266" ref-type="ref">266</xref>
While many of these SSDs are technically impressive, their evaluation too often relies on qualitative data,
<xref rid="wcs1375-bib-0237" ref-type="ref">237</xref>
,
<xref rid="wcs1375-bib-0238" ref-type="ref">238</xref>
,
<xref rid="wcs1375-bib-0242" ref-type="ref">242</xref>
,
<xref rid="wcs1375-bib-0243" ref-type="ref">243</xref>
,
<xref rid="wcs1375-bib-0244" ref-type="ref">244</xref>
,
<xref rid="wcs1375-bib-0245" ref-type="ref">245</xref>
,
<xref rid="wcs1375-bib-0247" ref-type="ref">247</xref>
,
<xref rid="wcs1375-bib-0251" ref-type="ref">251</xref>
,
<xref rid="wcs1375-bib-0252" ref-type="ref">252</xref>
a very small number of blind participants (i.e., five or less),
<xref rid="wcs1375-bib-0239" ref-type="ref">239</xref>
,
<xref rid="wcs1375-bib-0241" ref-type="ref">241</xref>
,
<xref rid="wcs1375-bib-0248" ref-type="ref">248</xref>
,
<xref rid="wcs1375-bib-0250" ref-type="ref">250</xref>
,
<xref rid="wcs1375-bib-0260" ref-type="ref">260</xref>
,
<xref rid="wcs1375-bib-0262" ref-type="ref">262</xref>
,
<xref rid="wcs1375-bib-0263" ref-type="ref">263</xref>
,
<xref rid="wcs1375-bib-0267" ref-type="ref">267</xref>
or only blindfolded sighted participants.
<xref rid="wcs1375-bib-0233" ref-type="ref">233</xref>
,
<xref rid="wcs1375-bib-0240" ref-type="ref">240</xref>
,
<xref rid="wcs1375-bib-0246" ref-type="ref">246</xref>
,
<xref rid="wcs1375-bib-0249" ref-type="ref">249</xref>
,
<xref rid="wcs1375-bib-0261" ref-type="ref">261</xref>
,
<xref rid="wcs1375-bib-0264" ref-type="ref">264</xref>
,
<xref rid="wcs1375-bib-0265" ref-type="ref">265</xref>
However, with an adequate number of blind participants, some researchers have demonstrated that blind people are capable of using some devices for navigation.
<xref rid="wcs1375-bib-0234" ref-type="ref">234</xref>
,
<xref rid="wcs1375-bib-0253" ref-type="ref">253</xref>
,
<xref rid="wcs1375-bib-0254" ref-type="ref">254</xref>
,
<xref rid="wcs1375-bib-0256" ref-type="ref">256</xref>
,
<xref rid="wcs1375-bib-0257" ref-type="ref">257</xref>
,
<xref rid="wcs1375-bib-0258" ref-type="ref">258</xref>
,
<xref rid="wcs1375-bib-0268" ref-type="ref">268</xref>
,
<xref rid="wcs1375-bib-0269" ref-type="ref">269</xref>
</p>
<p id="wcs1375-para-0035">Some of these SSDs have been tested in the context of locomotion with varying success. For example, the Tongue Display Unit (TDU) transforms visual information into electrotactile stimulation that conveys the position of obstacles in the surrounding environment. Blind participants have been shown to effectively use the device in order to navigate a virtual maze
<xref rid="wcs1375-bib-0047" ref-type="ref">47</xref>
and even outperform blindfolded sighted participants in a high contrast, life‐size, obstacle course.
<xref rid="wcs1375-bib-0200" ref-type="ref">200</xref>
Similarly, Dunai and colleagues
<xref rid="wcs1375-bib-0268" ref-type="ref">268</xref>
showed that training with their Acoustic Prototype allowed blind participants to perceive and avoid objects in indoor and outdoor obstacle courses. In addition, the EyeCane is a device for transforming distance information into both sounds and vibrations.
<xref rid="wcs1375-bib-0270" ref-type="ref">270</xref>
The EyeCane has been successfully used in a virtual obstacle avoidance task
<xref rid="wcs1375-bib-0270" ref-type="ref">270</xref>
and in a real life‐size Hebb‐Williams maze.
<xref rid="wcs1375-bib-0129" ref-type="ref">129</xref>
Despite the recent achievements of both TDUs and the EyeCane, participants using these devices had some difficulties avoiding obstacles near the ground.
<xref rid="wcs1375-bib-0129" ref-type="ref">129</xref>
,
<xref rid="wcs1375-bib-0271" ref-type="ref">271</xref>
</p>
<p id="wcs1375-para-0036">SSDs have also been developed for wayfinding assistance. For example, Marston and colleagues
<xref rid="wcs1375-bib-0253" ref-type="ref">253</xref>
successfully directed blind participants along real world paths using different auditory displays. Similarly, Kalia and colleagues
<xref rid="wcs1375-bib-0254" ref-type="ref">254</xref>
conveyed distance information to blind and blindfolded sighted participants with the aid of a digital map and synthetic speech. In addition, some researchers have shown that auditory and tactile virtual reality training can facilitate wayfinding in a corresponding real environment.
<xref rid="wcs1375-bib-0258" ref-type="ref">258</xref>
,
<xref rid="wcs1375-bib-0269" ref-type="ref">269</xref>
Together these studies suggest that SSDs can benefit blind people during navigation. However, Loomis and colleagues
<xref rid="wcs1375-bib-0006" ref-type="ref">6</xref>
have argued that the success of SSDs is dependent on the extent to which the information they provide is relatively simple and task‐specific. Before SSDs can be widely applied, we need to gain a better understanding of the navigation abilities of the blind population.</p>
</sec>
<sec id="wcs1375-sec-0017">
<title>Heterogeneity in the Blind Population</title>
<p id="wcs1375-para-0037">Any intervention intended to support navigation by blind people requires an understanding of their needs as a group and as individuals. Heterogeneity in the blind population has created many difficulties for researchers
<xref rid="wcs1375-bib-0013" ref-type="ref">13</xref>
,
<xref rid="wcs1375-bib-0272" ref-type="ref">272</xref>
and cross‐study comparisons.
<xref rid="wcs1375-bib-0189" ref-type="ref">189</xref>
These difficulties stem from at least five methodological factors, including sample size, type of impairment, age of onset, level of education and intelligence, and level of orientation and mobility (for a review, see Ref
<xref rid="wcs1375-bib-0075" ref-type="ref">75</xref>
). Many studies have reported findings regarding the navigation performance of blind people using small sample sizes (e.g., eight,
<xref rid="wcs1375-bib-0109" ref-type="ref">109</xref>
seven,
<xref rid="wcs1375-bib-0011" ref-type="ref">11</xref>
six,
<xref rid="wcs1375-bib-0080" ref-type="ref">80</xref>
two,
<xref rid="wcs1375-bib-0092" ref-type="ref">92</xref>
and one
<xref rid="wcs1375-bib-0084" ref-type="ref">84</xref>
), which makes it difficult to generalize from one study to another. Type of impairment and age of onset can also lead to challenges with the assignment of participants to experimental groups. Moore and colleagues
<xref rid="wcs1375-bib-0273" ref-type="ref">273</xref>
estimate that 75% of those considered blind have some remaining vision. For example, people with only light perception are often classified as totally blind.
<xref rid="wcs1375-bib-0274" ref-type="ref">274</xref>
Past studies have found performance differences related to both type of impairment (e.g., lower performance for retrolental fibroplasia
<xref rid="wcs1375-bib-0275" ref-type="ref">275</xref>
) and age of onset.
<xref rid="wcs1375-bib-0110" ref-type="ref">110</xref>
In addition, level of education and intelligence has been found to correlate with performance on a map task
<xref rid="wcs1375-bib-0275" ref-type="ref">275</xref>
and sometimes creates potential confounds.
<xref rid="wcs1375-bib-0039" ref-type="ref">39</xref>
Finally, assessments of level of orientation and mobility at the time of testing may be an important factor to consider when studying the acquisition of spatial knowledge.
<xref rid="wcs1375-bib-0083" ref-type="ref">83</xref>
</p>
</sec>
<sec id="wcs1375-sec-0018">
<title>Navigation Strategies</title>
<p id="wcs1375-para-0038">The study of navigation strategies provides an innovative way of addressing challenges associated with the heterogeneous nature of the blind population. Previous research has required blind and sighted participants to adopt similar strategies in order to complete a particular task. However, this approach has led to difficulties in extracting consistent patterns in spatial knowledge acquisition during navigation. While the number of studies on navigation strategies in blind people is limited,
<xref rid="wcs1375-bib-0008" ref-type="ref">8</xref>
,
<xref rid="wcs1375-bib-0016" ref-type="ref">16</xref>
,
<xref rid="wcs1375-bib-0276" ref-type="ref">276</xref>
they suggest that performances on spatial tasks are strongly associated with strategy choice for both blind and sighted individuals. Such investigations were also limited in the past given methodological challenges such as collecting path information and the manual classification of strategies (but see Ref
<xref rid="wcs1375-bib-0035" ref-type="ref">35</xref>
).</p>
<p id="wcs1375-para-0039">Originally, search strategies were classified by Hill and Ponder
<xref rid="wcs1375-bib-0277" ref-type="ref">277</xref>
as part of orientation and mobility training. The perimeter (e.g., walking along the walls of a room) and gridline (e.g., walking parallel transects from one wall to the opposite wall) strategies allowed the visually impaired to systematically explore novel environments. After initial learning, Tellevik
<xref rid="wcs1375-bib-0278" ref-type="ref">278</xref>
found that blindfolded sighted participants (all mobility instructors) tended to shift from the perimeter or gridline strategies to a reference point strategy (i.e., walking from a known location to each target object and back). Hill and colleagues
<xref rid="wcs1375-bib-0276" ref-type="ref">276</xref>
further characterized three reference point strategies as object‐to‐object, object‐to‐wall, or object‐to‐start. They found that participants who chose one of these three strategies also provided the most accurate direction estimates irrespective of level of visual impairment.
<xref rid="wcs1375-bib-0276" ref-type="ref">276</xref>
However, a subsequent study showed that blind participants used these reference point strategies less often than blindfolded sighted controls and instead opted for a cyclic search pattern (i.e., walking to each object sequentially
<xref rid="wcs1375-bib-0008" ref-type="ref">8</xref>
). In this case, the cyclic strategy was associated with worse performance than the reference point strategy.
<xref rid="wcs1375-bib-0008" ref-type="ref">8</xref>
,
<xref rid="wcs1375-bib-0279" ref-type="ref">279</xref>
Schinazi
<xref rid="wcs1375-bib-0016" ref-type="ref">16</xref>
replicated the relationship between the reference point strategy and better performances on a variety of spatial tasks. However, when visual information is available, the cyclic strategy was also related to better performance.</p>
</sec>
</sec>
<sec id="wcs1375-sec-0019">
<title>CONCLUSION</title>
<p id="wcs1375-para-0040">The systematic testing of scientific models sometimes requires the adaptation of existing frameworks in order to incorporate findings from disparate fields. In this review, we have attempted to bridge spatial cognition and visual impairment literatures, including recent advances in neuroscience and technology, in order to gain a better understanding of the navigation abilities in blind people. Towards this end, we proposed that future research should allow for blind and sighted individuals to adopt different strategies that do not artificially limit their potential. We also proposed three models of spatial knowledge acquisition by blind and sighted people and attempted to characterize previous research in these terms. This procedure highlighted the importance of measuring spatial learning over time in order to assess learning potential in the absence of vision. This longitudinal approach also allows for the investigation of hypotheses regarding amodal spatial representation. Along with existing studies on the functional equivalence of different perceptual modalities, we proposed a line of research on the Bayesian integration of spatial cues from multiple modalities used by blind people. This is complemented by a review of the neural correlates of navigation by blind people within the context of functional reorganization. The topic of functional reorganization was also considered in light of new developments for SSDs that were specifically designed to aid navigation by blind individuals. Future considerations also included methodological issues resulting from heterogeneity in the blind population and the ways in which they may be addressed with research on navigation strategies.</p>
</sec>
</body>
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