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<title xml:lang="en">Onset rivalry: the initial dominance phase is independent of ongoing perceptual alternations</title>
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<name sortKey="Stanley, Jody" sort="Stanley, Jody" uniqKey="Stanley J" first="Jody" last="Stanley">Jody Stanley</name>
<affiliation>
<nlm:aff id="aff1">
<institution>Psychological Sciences, University of Melbourne</institution>
<country>Parkville, VIC, Australia</country>
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</affiliation>
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<author>
<name sortKey="Forte, Jason D" sort="Forte, Jason D" uniqKey="Forte J" first="Jason D." last="Forte">Jason D. Forte</name>
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<nlm:aff id="aff1">
<institution>Psychological Sciences, University of Melbourne</institution>
<country>Parkville, VIC, Australia</country>
</nlm:aff>
</affiliation>
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<author>
<name sortKey="Cavanagh, Patrick" sort="Cavanagh, Patrick" uniqKey="Cavanagh P" first="Patrick" last="Cavanagh">Patrick Cavanagh</name>
<affiliation>
<nlm:aff id="aff2">
<institution>Department of Psychology, Harvard University</institution>
<country>Cambridge, MA, USA</country>
</nlm:aff>
</affiliation>
<affiliation>
<nlm:aff id="aff3">
<institution>Laboratoire Psychologie de la Perception, Université Paris Descartes</institution>
<country>Paris, France</country>
</nlm:aff>
</affiliation>
</author>
<author>
<name sortKey="Carter, Olivia" sort="Carter, Olivia" uniqKey="Carter O" first="Olivia" last="Carter">Olivia Carter</name>
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<nlm:aff id="aff1">
<institution>Psychological Sciences, University of Melbourne</institution>
<country>Parkville, VIC, Australia</country>
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<idno type="pmid">22319483</idno>
<idno type="pmc">3258971</idno>
<idno type="url">http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3258971</idno>
<idno type="RBID">PMC:3258971</idno>
<idno type="doi">10.3389/fnhum.2011.00140</idno>
<date when="2011">2011</date>
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<title xml:lang="en" level="a" type="main">Onset rivalry: the initial dominance phase is independent of ongoing perceptual alternations</title>
<author>
<name sortKey="Stanley, Jody" sort="Stanley, Jody" uniqKey="Stanley J" first="Jody" last="Stanley">Jody Stanley</name>
<affiliation>
<nlm:aff id="aff1">
<institution>Psychological Sciences, University of Melbourne</institution>
<country>Parkville, VIC, Australia</country>
</nlm:aff>
</affiliation>
</author>
<author>
<name sortKey="Forte, Jason D" sort="Forte, Jason D" uniqKey="Forte J" first="Jason D." last="Forte">Jason D. Forte</name>
<affiliation>
<nlm:aff id="aff1">
<institution>Psychological Sciences, University of Melbourne</institution>
<country>Parkville, VIC, Australia</country>
</nlm:aff>
</affiliation>
</author>
<author>
<name sortKey="Cavanagh, Patrick" sort="Cavanagh, Patrick" uniqKey="Cavanagh P" first="Patrick" last="Cavanagh">Patrick Cavanagh</name>
<affiliation>
<nlm:aff id="aff2">
<institution>Department of Psychology, Harvard University</institution>
<country>Cambridge, MA, USA</country>
</nlm:aff>
</affiliation>
<affiliation>
<nlm:aff id="aff3">
<institution>Laboratoire Psychologie de la Perception, Université Paris Descartes</institution>
<country>Paris, France</country>
</nlm:aff>
</affiliation>
</author>
<author>
<name sortKey="Carter, Olivia" sort="Carter, Olivia" uniqKey="Carter O" first="Olivia" last="Carter">Olivia Carter</name>
<affiliation>
<nlm:aff id="aff1">
<institution>Psychological Sciences, University of Melbourne</institution>
<country>Parkville, VIC, Australia</country>
</nlm:aff>
</affiliation>
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<series>
<title level="j">Frontiers in Human Neuroscience</title>
<idno type="eISSN">1662-5161</idno>
<imprint>
<date when="2011">2011</date>
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<div type="abstract" xml:lang="en">
<p>Binocular rivalry has been used to study a wide range of visual processes, from the integration of low-level features to the selection of signals that reach awareness. However, many of these studies do not distinguish between early and late phases of rivalry. There is clear evidence that the “onset” stage of rivalry is characterized by stable, yet idiosyncratic biases that are not evident in the average dominance of sustained rivalry viewing. Low-level stimulus features also have robust effects in the onset phase that are not seen in sustained rivalry, suggesting these phases may be driven at least partly by different neural mechanisms. The effects of high-level cognitive and affective factors at onset are less clear but also show differences from their effects in sustained viewing. These findings have important implications for the interpretation of any rivalry experiments using brief presentation paradigms and for understanding how the brain copes with binocular discrepancies in natural viewing conditions in which our eyes constantly move around an ever-changing environment. This review will summarize current research and explore the factors influencing this “onset” stage.</p>
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<pmc article-type="research-article">
<pmc-dir>properties open_access</pmc-dir>
<front>
<journal-meta>
<journal-id journal-id-type="nlm-ta">Front Hum Neurosci</journal-id>
<journal-id journal-id-type="publisher-id">Front. Hum. Neurosci.</journal-id>
<journal-title-group>
<journal-title>Frontiers in Human Neuroscience</journal-title>
</journal-title-group>
<issn pub-type="epub">1662-5161</issn>
<publisher>
<publisher-name>Frontiers Research Foundation</publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id pub-id-type="pmid">22319483</article-id>
<article-id pub-id-type="pmc">3258971</article-id>
<article-id pub-id-type="doi">10.3389/fnhum.2011.00140</article-id>
<article-categories>
<subj-group subj-group-type="heading">
<subject>Neuroscience</subject>
<subj-group>
<subject>Review Article</subject>
</subj-group>
</subj-group>
</article-categories>
<title-group>
<article-title>Onset rivalry: the initial dominance phase is independent of ongoing perceptual alternations</article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname>Stanley</surname>
<given-names>Jody</given-names>
</name>
<xref ref-type="aff" rid="aff1">
<sup>1</sup>
</xref>
<xref ref-type="author-notes" rid="fn001">
<sup>*</sup>
</xref>
</contrib>
<contrib contrib-type="author">
<name>
<surname>Forte</surname>
<given-names>Jason D.</given-names>
</name>
<xref ref-type="aff" rid="aff1">
<sup>1</sup>
</xref>
</contrib>
<contrib contrib-type="author">
<name>
<surname>Cavanagh</surname>
<given-names>Patrick</given-names>
</name>
<xref ref-type="aff" rid="aff2">
<sup>2</sup>
</xref>
<xref ref-type="aff" rid="aff3">
<sup>3</sup>
</xref>
</contrib>
<contrib contrib-type="author">
<name>
<surname>Carter</surname>
<given-names>Olivia</given-names>
</name>
<xref ref-type="aff" rid="aff1">
<sup>1</sup>
</xref>
</contrib>
</contrib-group>
<aff id="aff1">
<sup>1</sup>
<institution>Psychological Sciences, University of Melbourne</institution>
<country>Parkville, VIC, Australia</country>
</aff>
<aff id="aff2">
<sup>2</sup>
<institution>Department of Psychology, Harvard University</institution>
<country>Cambridge, MA, USA</country>
</aff>
<aff id="aff3">
<sup>3</sup>
<institution>Laboratoire Psychologie de la Perception, Université Paris Descartes</institution>
<country>Paris, France</country>
</aff>
<author-notes>
<fn fn-type="edited-by">
<p>Edited by:
<italic>Naotsugu Tsuchiya, RIKEN, Japan</italic>
</p>
</fn>
<fn fn-type="edited-by">
<p>Reviewed by:
<italic>Randolph Blake, Seoul National University, South Korea Jan Brascamp, Vanderbilt University, USA</italic>
</p>
</fn>
<corresp id="fn001">*Correspondence:
<italic>Jody Stanley, Psychological Sciences, University of Melbourne, Parkville, VIC 3010, Australia. e-mail:
<email>jodys@unimelb.edu.au</email>
</italic>
</corresp>
</author-notes>
<pub-date pub-type="epub">
<day>05</day>
<month>12</month>
<year>2011</year>
</pub-date>
<pub-date pub-type="collection">
<year>2011</year>
</pub-date>
<volume>5</volume>
<elocation-id>140</elocation-id>
<history>
<date date-type="received">
<day>01</day>
<month>8</month>
<year>2011</year>
</date>
<date date-type="accepted">
<day>01</day>
<month>11</month>
<year>2011</year>
</date>
</history>
<permissions>
<copyright-statement>Copyright © 2011 Stanley, Forte, Cavanagh and Carter.</copyright-statement>
<copyright-year>2011</copyright-year>
<license license-type="open-access" xlink:href="http://www.frontiersin.org/licenseagreement">
<license-p>This is an open-access article subject to a non-exclusive license between the authors and Frontiers Media SA, which permits use, distribution and reproduction in other forums, provided the original authors and source are credited and other Frontiers conditions are complied with.</license-p>
</license>
</permissions>
<abstract>
<p>Binocular rivalry has been used to study a wide range of visual processes, from the integration of low-level features to the selection of signals that reach awareness. However, many of these studies do not distinguish between early and late phases of rivalry. There is clear evidence that the “onset” stage of rivalry is characterized by stable, yet idiosyncratic biases that are not evident in the average dominance of sustained rivalry viewing. Low-level stimulus features also have robust effects in the onset phase that are not seen in sustained rivalry, suggesting these phases may be driven at least partly by different neural mechanisms. The effects of high-level cognitive and affective factors at onset are less clear but also show differences from their effects in sustained viewing. These findings have important implications for the interpretation of any rivalry experiments using brief presentation paradigms and for understanding how the brain copes with binocular discrepancies in natural viewing conditions in which our eyes constantly move around an ever-changing environment. This review will summarize current research and explore the factors influencing this “onset” stage.</p>
</abstract>
<kwd-group>
<kwd>binocular rivalry</kwd>
<kwd>perceptual bias</kwd>
<kwd>vision</kwd>
<kwd>awareness</kwd>
<kwd>ambiguity</kwd>
<kwd>visual field</kwd>
<kwd>suppression</kwd>
<kwd>bistable stimuli</kwd>
</kwd-group>
<counts>
<fig-count count="3"></fig-count>
<table-count count="1"></table-count>
<equation-count count="0"></equation-count>
<ref-count count="64"></ref-count>
<page-count count="9"></page-count>
<word-count count="0"></word-count>
</counts>
</article-meta>
</front>
<body>
<p>When dissimilar images are presented respectively to the two eyes, an initial fusion of the two scenes (
<xref ref-type="bibr" rid="B64">Wolfe, 1983</xref>
) is rapidly replaced by the perception of only one of the two images. If the observer continues to view these images, conscious perception will alternate between the two monocular percepts indefinitely (
<xref ref-type="bibr" rid="B62">Wheatstone, 1838</xref>
;
<xref ref-type="bibr" rid="B3">Blake and Logothetis, 2002</xref>
). Such “binocular rivalry” occurs without any change to the stimuli themselves. This disparity between unchanging stimuli and fluctuating conscious perception has provided an important tool for studying a vast range of neural processes, from early visual features such as luminance (
<xref ref-type="bibr" rid="B27">Kaplan and Metlay, 1964</xref>
), contrast (
<xref ref-type="bibr" rid="B42">Mueller and Blake, 1989</xref>
), and motion (
<xref ref-type="bibr" rid="B4">Blake et al., 2003</xref>
), to visual processing in psychiatric populations (
<xref ref-type="bibr" rid="B39">Miller et al., 2003</xref>
;
<xref ref-type="bibr" rid="B43">Nagamine et al., 2007</xref>
), and the neural correlates of conscious awareness (
<xref ref-type="bibr" rid="B37">Logothetis, 1998</xref>
;
<xref ref-type="bibr" rid="B39">Lin and He, 2009</xref>
). While binocular rivalry is a psychophysical paradigm, it has been used in conjunction with a variety of brain imaging (
<xref ref-type="bibr" rid="B55">Tong and Engel, 2001</xref>
;
<xref ref-type="bibr" rid="B21">Haynes et al., 2005</xref>
;
<xref ref-type="bibr" rid="B32">Lee et al., 2005</xref>
) and electrophysiological measures (
<xref ref-type="bibr" rid="B33">Leopold and Logothetis, 1996</xref>
) that have all contributed to providing considerable information about the associated brain mechanisms involved in visual processing and awareness.</p>
<p>Until recently, it was assumed that, subsequent to fusion, all rivalry was guided by a common process (or set of processes). Recent studies have now demonstrated that the initial properties of rivalry differ significantly from those seen over extended periods and may, in fact, be determined by distinct mechanisms. Most notable is the striking degree of stability and predictability in perceptual dominance at rivalry onset, which stands in complete contrast to the stochastic nature of perceptual switches that is often considered a fundamental property of sustained perceptual rivalry viewing (
<xref ref-type="bibr" rid="B19">Fox and Herrmann, 1967</xref>
;
<xref ref-type="bibr" rid="B28">Kim et al., 2006</xref>
;
<xref ref-type="bibr" rid="B60">van Ee, 2009</xref>
). This paper will review recent results concerning the different factors that affect onset rivalry and the differences between this onset phase and sustained rivalry. This review will also briefly consider the implications for current perceptual rivalry research.</p>
<sec id="s1">
<title>ONSET BIASES ACROSS THE VISUAL FIELD</title>
<p>One of the most striking characteristics of onset rivalry is the existence of strong and stable localized biases that vary across the visual field both within and between subjects (
<xref ref-type="bibr" rid="B11">Carter and Cavanagh, 2007</xref>
;
<xref ref-type="bibr" rid="B52">Stanley et al., 2011</xref>
; see
<bold>Figure
<xref ref-type="fig" rid="F1">1</xref>
</bold>
). For example, one area of the visual field may have a strong onset rivalry bias, so that the same target is seen first on almost every trial. In another area of the visual field, however, the opposite target might be almost exclusively dominant at onset. This onset bias can only be partly explained by monocular dominance, and despite the idiosyncratic nature of the pattern of onset bias across the visual field, it is found to be stable across weeks within an individual. Such biases toward dominance of a given target were not seen during subsequent alternations in sustained rivalry (
<xref ref-type="bibr" rid="B11">Carter and Cavanagh, 2007</xref>
).</p>
<fig id="F1" position="float">
<label>FIGURE 1</label>
<caption>
<p>
<bold>Onset biases: (A)</bold>
Examples of stimuli used to assess onset rivalry in the fovea. Orthogonal green and black, and red and black gratings were presented to the fovea for 60 presentations of 1sec (with 9 sec of stimulus removal), or 60sec of continuous presentation.
<bold>(B)</bold>
Data from two subjects show consistent, but opposite onset biases during the 60 intermittent 1 sec presentations (over 600 sec). In the sustained 60 sec presentation, however, average dominance durations show no bias (modified from
<xref ref-type="bibr" rid="B11">Carter and Cavanagh, 2007</xref>
).
<bold>(C)</bold>
A schematic illustrating the time course of rivalry over four trials depicts a consistent bias toward one target at onset, while dominance at a given time during the rest of the sustained viewing period is random.</p>
</caption>
<graphic xlink:href="fnhum-05-00140-g001"></graphic>
</fig>
<p>Onset rivalry also differs from sustained rivalry dominance periods in respect to the effects of equating stimulus strength. It is well established that changing the contrast, luminance, or spatial frequency of one rivaling target will reliably increase the proportion of dominance of that target over a sustained viewing period, and conversely, equating the stimuli will reduce these biases (
<xref ref-type="bibr" rid="B35">Levelt, 1967</xref>
). Onset rivalry is also strongly biased toward a target with greater stimulus strength (
<xref ref-type="bibr" rid="B14">Chong and Blake, 2006</xref>
;
<xref ref-type="bibr" rid="B51">Song and Yao, 2009</xref>
). Unlike sustained rivalry, however, the initial presentation of balanced stimuli will not necessarily result in an equal likelihood of either target gaining dominance at onset. At the onset of rivalry, strong and consistent onset biases remain after minimizing the luminance and contrast differences by calibrating the stimuli separately for each individual and in each location of the visual field (
<xref ref-type="bibr" rid="B52">Stanley et al., 2011</xref>
; see
<bold>Figures
<xref ref-type="fig" rid="F2">2A</xref>
<xref ref-type="fig" rid="F2">C</xref>
</bold>
). The persistence of the localized onset bias suggests that other endogenous factors determine onset dominance. For example, the fact that swapping the eye of presentation of the calibrated images has led to complete reversal of perceived color in some areas, suggests that regions of monocular dominance may also have an influence on onset rivalry (
<xref ref-type="bibr" rid="B52">Stanley et al., 2011</xref>
).</p>
</sec>
<sec>
<title>LOW-LEVEL EFFECTS ON ONSET DOMINANCE</title>
<p>The influence of monocular dominance on the initial dominance phase in rivalry has been reported previously. In an early study on color rivalry,
<xref ref-type="bibr" rid="B16">Crovitz and Lipscomb (1963)</xref>
presented split and full color red and green fields for 100 ms in rivaling conditions. They found that observers most commonly reported a percept corresponding to the colors presented in the temporal visual fields (
<xref ref-type="bibr" rid="B16">Crovitz and Lipscomb, 1963</xref>
). Similarly,
<xref ref-type="bibr" rid="B31">Leat and Woodhouse (1984)</xref>
showed that flashed stimuli, which engage only the onset phase of rivalry, showed a dominance bias as great as approximately 5–95% in some individuals compared to continuous presentations, which were generally quite balanced with approximately 50% dominance. Although dominance biases for flashed and continuous presentations were correlated, the authors concluded that the difference in the range of bias indicated that flashed stimuli were more sensitive to ocular dominance by a factor of 10–20. Some observers showed enhanced dominance of the nasal retinas and others of the temporal retinas, but either pattern of dominance tended to be consistent within one-half of the visual field (
<xref ref-type="bibr" rid="B31">Leat and Woodhouse, 1984</xref>
). Although there was very little evidence of dominance bias during sustained viewing, more recent studies have shown that visual field location can affect the overall rate of switching in sustained rivalry (
<xref ref-type="bibr" rid="B13">Chen and He, 2003</xref>
). As these onset studies show, initial dominance is particularly sensitive to zones of monocular dominance that exist across the visual field. However, the substantial individual difference in the pattern of ocular dominance seen with a range of rivalry stimuli (
<xref ref-type="bibr" rid="B26">Kalisvaart et al., 2011</xref>
;
<xref ref-type="bibr" rid="B52">Stanley et al., 2011</xref>
), and the fact that hemifield effects are not always seen if the rivaling targets are not carefully calibrated (
<xref ref-type="bibr" rid="B11">Carter and Cavanagh, 2007</xref>
) shows that monocular dominance cannot fully explain the biases in onset rivalry (see
<bold>Figure
<xref ref-type="fig" rid="F2">2</xref>
</bold>
).</p>
<fig id="F2" position="float">
<label>FIGURE 2</label>
<caption>
<p>
<bold>Idiosyncrasies of onset rivalry across the visual field. (A)</bold>
Peripheral stimuli used to test location specific onset biases within an individual. Orthogonal gratings were presented to the left and right eye, in eight locations of the visual field. The black dotted outlines of these locations are for illustration only and were not part of the experimental display. To the right is a schematic of the data presentation used in
<bold>(B,C)</bold>
. Each block of color represents the reported perceptual dominance at an individual stimulus onset (the eight wedges represent the eight locations and time is illustrated with the inner and outer locations representing the first and last presentations respectively.
<bold>(B)</bold>
On the left, data from sustained rivalry presentation in the periphery shows no dominance bias of either target (each loop represents 1 sec of presentation during 60 sec of sustained rivalry). In contrast the two right panels show that during onset rivalry the pattern of biases within a single person vary depending on the location of the visual field and the eye of presentation (individual data from S4 in
<xref ref-type="bibr" rid="B11">Carter and Cavanagh, 2007</xref>
).
<bold>(C)</bold>
Data from the same observer shows that when brightness is matched in each location onset biases remain, which is representative of the results seen across participants. Though there are still clear biases, some change in the pattern is evident after balancing the targets. For example, some locations have an exaggerated bias while others have less complete bias, and in some cases the preferred color has switched. With the calibrated rivalry targets, some locations show a complete reversal of onset bias when targets are presented to the opposite eyes, suggesting influence of monocular dominance (individual data from S4 in Experiment 1 of
<xref ref-type="bibr" rid="B52">Stanley et al., 2011</xref>
).
<bold>(D)</bold>
Ambiguous opponent motion stimuli presented to the right or left of fixation induces similar idiosyncratic onset biases (modified from Figure
<xref ref-type="fig" rid="F1">1</xref>
in
<xref ref-type="bibr" rid="B26">Kalisvaart et al., 2011</xref>
).
<bold>(E)</bold>
At the onset of sustained presentation, S1 and S2 showed right and left eye bias, respectively, and S3 showed temporal field bias. However, subjects displayed no dominance bias during later periods of the presentation (modified from Figure
<xref ref-type="fig" rid="F3">3</xref>
in
<xref ref-type="bibr" rid="B26">Kalisvaart et al., 2011</xref>
).</p>
</caption>
<graphic xlink:href="fnhum-05-00140-g002"></graphic>
</fig>
<p>The finding that visual field effects are revealed after individually equating brightness in each eye suggests that there is an interaction between endogenous biases and influences that originate from the stimuli themselves. For example, influences from ocular dominance appear to interact with hypersensitivity at onset to differences in stimuli strength. With respect to stimulus strength, onset dominance appears to be particularly sensitive to small imbalances in luminance contrast (
<xref ref-type="bibr" rid="B14">Chong and Blake, 2006</xref>
;
<xref ref-type="bibr" rid="B51">Song and Yao, 2009</xref>
; see
<bold>Figure
<xref ref-type="fig" rid="F3">3</xref>
</bold>
). Onset dominance may be so sensitive to contrast differences that variability in spectral sensitivity between individuals and across the retina (
<xref ref-type="bibr" rid="B1">Albrecht et al., 2002</xref>
) may be sufficient to influence the pattern of onset bias (
<xref ref-type="bibr" rid="B52">Stanley et al., 2011</xref>
). Other studies have shown that both exogenous (
<xref ref-type="bibr" rid="B40">Mitchell et al., 2004</xref>
;
<xref ref-type="bibr" rid="B14">Chong and Blake, 2006</xref>
) and endogenous (
<xref ref-type="bibr" rid="B14">Chong and Blake, 2006</xref>
) attention have a greater influence at onset than on average dominance during sustained presentation. While attention is often thought of as a high-level effect, the authors suggest that their observed effect of attention may have, in fact, been mediated by an increase in apparent contrast (
<xref ref-type="bibr" rid="B14">Chong and Blake, 2006</xref>
). This interpretation was based on the finding that directing attention to a grating has been claimed to boost the apparent contrast between 30 and 70% (
<xref ref-type="bibr" rid="B10">Carrasco et al., 2004</xref>
).</p>
<fig id="F3" position="float">
<label>FIGURE 3</label>
<caption>
<p>
<bold>Onset dominance is more sensitive to contrast imbalances than sustained dominance.</bold>
By comparing stimuli with varying contrast imbalances (ranging in contrast ratios of 50:50 to 90:10), it was found that small imbalances are sufficient to cause exclusive dominance of the higher-contrast image at onset. In the case of sustained rivalry, however, exclusive dominance was never achieved even at the greatest contrast imbalance of 90:10 (modified from Figure
<xref ref-type="fig" rid="F2">2B</xref>
in
<xref ref-type="bibr" rid="B51">Song and Yao, 2009</xref>
).</p>
</caption>
<graphic xlink:href="fnhum-05-00140-g003"></graphic>
</fig>
<p>The degree of location specificity observed across the visual field at rivalry onset suggests the endogenous biases are closely tied to the position of the image on the retina. Consistent with this view, it was shown that when rivaling images were displaced on the retina—through saccades or through shifting the stimulus itself— the dominant percept after the shift was systematically related to the initial onset bias displayed by each subject (
<xref ref-type="bibr" rid="B26">Kalisvaart et al., 2011</xref>
). These findings suggest that engaging new areas of the retina will again recruit onset processes. Interestingly, although this result was observed after both a saccade and a stimulus jump, the relationship between percept dominance and onset bias was weaker after a saccade. Despite both conditions engaging new areas of the retina, an active saccade appeared to diminish the effects of onset rivalry bias. There are currently no data available to determine the basis of this attenuation of the onset bias, however, possible causes could range from other relatively low-level effects beyond retinal signals to such high-level influences as saccadic remapping (
<xref ref-type="bibr" rid="B2">Bays and Husain, 2007</xref>
;
<xref ref-type="bibr" rid="B12">Cavanagh et al., 2010</xref>
).</p>
</sec>
<sec>
<title>HIGH-LEVEL EFFECTS ON ONSET DOMINANCE</title>
<p>Although most studies of the onset stage of rivalry have used features that are processed by the early visual system, there are a few studies that have investigated high-level, cognitive influences at rivalry onset. A recent study has shown that the utility of a particular percept can bias initial dominance in rivalry. When perception of one orientation of rivaling Gabor patches allowed observers to complete a search task more efficiently, observers were more likely to perceive that orientation as the initial percept, even though they were unaware of its utility. This bias continued even when the grating no longer provided any advantage to the task. Surprisingly, the influence of the learned utility of the grating orientation was limited exclusively to the onset phase and had no effect on subsequent dominance durations (
<xref ref-type="bibr" rid="B15">Chopin and Mamassian, 2010</xref>
).
<xref ref-type="bibr" rid="B17">Denison et al. (in press)</xref>
have shown that when rivalry of dichoptic orthogonal gratings is preceded by the predictive context of non-rivaling gratings in perceived rotation, there is a bias at the onset of rivalry toward the orientation that would match the next presentation in the rotation sequence.</p>
<p>Two other studies have investigated differences between images that influence psychological attributes like emotional saliency and show intriguing and somewhat contradictory effects with respect to initial dominance. The first study by
<xref ref-type="bibr" rid="B49">Sheth and Pham (2008)</xref>
used emotionally arousing images. These images showed no effect at the onset of rivalry, though the emotional content of the images affected overall percentage of dominance during sustained rivalry (
<xref ref-type="bibr" rid="B49">Sheth and Pham, 2008</xref>
). This finding suggests limited involvement at onset from higher areas where visual signals are coupled with emotional cues. However, a second study by
<xref ref-type="bibr" rid="B20">Gray et al. (2009)</xref>
found that an observer’s anxiety level had a strong effect on initial dominance of emotional faces, and was associated with an increased tendency to perceive angry faces and decreased tendency to perceive happy faces. Such results suggest that the relatively high-level factors of an observer’s emotional state and the emotional saliency of a rivaling target can affect rivalry during the onset stage. As this study only examined effects at the onset of rivalry, it is unclear whether heightened anxiety would continue to modulate an average dominance bias toward emotional stimuli over longer stimulus durations. Further research is needed to clarify the role of emotion and arousal in onset rivalry as distinct from their role in sustained rivalry.</p>
</sec>
<sec>
<title>ONSET BIASES USING OTHER AMBIGUOUS STIMULI</title>
<p>Although the onset stage of perceptual rivalry has been studied predominately using binocular rivalry stimuli, it is also important to note that disparate effects and biases at onset are also present when viewing other types of ambiguous stimuli.
<xref ref-type="bibr" rid="B18">Dobbins and Grossmann (2010)</xref>
presented rotating Necker cubes at various areas of the visual field and found that a cube rotating around a vertical axis was seen as viewed from above at onset more than 90% of the time, while a cube rotating around a horizontal axis was more likely to be interpreted as being viewed from the right side if it was placed on the left side of the screen. The authors suggest real-world asymmetries (e.g., boxes are more likely to be seen from above) are encoded in the visual system and this inherent expectation is particularly influential at onset (
<xref ref-type="bibr" rid="B18">Dobbins and Grossmann, 2010</xref>
).</p>
<p>The bistable auditory streaming paradigm (
<xref ref-type="bibr" rid="B48">Pressnitzer and Hupé, 2006</xref>
;
<xref ref-type="bibr" rid="B50">Snyder et al., 2009</xref>
) and plaid motion rivalry (
<xref ref-type="bibr" rid="B25">Hupé and Rubin, 2003</xref>
) have also been shown to have strong onset biases. In both cases the “coherent” percept of the visual plaid or single auditory stream is almost exclusively found to dominate at stimulus onset (
<xref ref-type="bibr" rid="B25">Hupé and Rubin, 2003</xref>
;
<xref ref-type="bibr" rid="B48">Pressnitzer and Hupé, 2006</xref>
;
<xref ref-type="bibr" rid="B50">Snyder et al., 2009</xref>
). While we are not aware of any study that has specifically investigated onset dominance during tactile rivalry, it has been reported that proprioceptive and tactile stimuli known to induce illusory motion reversals show exclusive dominance of the veridical motion direction at stimulus onset and will only alternate in a more balanced fashion after sustained stimulus presentation (
<xref ref-type="bibr" rid="B24">Holcombe and Seizova-Cajic, 2008</xref>
). A summary of current literature investigating the distinct onset phase of rivalry can be found in
<bold>Table
<xref ref-type="table" rid="T1">1</xref>
</bold>
.</p>
<table-wrap id="T1" position="float">
<label>Table 1</label>
<caption>
<p>Studies investigating onset dominance in binocular rivalry.</p>
</caption>
<table frame="hsides" rules="groups">
<thead>
<tr>
<th valign="top" align="left" rowspan="1" colspan="1">Study</th>
<th valign="top" align="left" rowspan="1" colspan="1">Onset effect</th>
<th valign="top" align="left" rowspan="1" colspan="1">Sustained effect
<xref ref-type="fn" rid="T1fn01">*</xref>
</th>
</tr>
</thead>
<tbody>
<tr>
<td align="left" rowspan="4" colspan="1">Visual field location</td>
<td align="left" rowspan="1" colspan="1">Dominance of the temporal hemifields demonstrated using full-field color stimuli (
<xref ref-type="bibr" rid="B16">Crovitz and Lipscomb, 1963</xref>
)</td>
<td align="left" rowspan="1" colspan="1">Not assessed in
<xref ref-type="bibr" rid="B16">Crovitz and Lipscomb (1963)</xref>
</td>
</tr>
<tr>
<td align="left" rowspan="1" colspan="1">Hemifield dominance shown using gratings presented along horizontal midline, however, the dominant hemifield (temporal/ nasal) varied between observers (
<xref ref-type="bibr" rid="B31">Leat and Woodhouse, 1984</xref>
)</td>
<td align="left" rowspan="1" colspan="1">No dominance bias in hemifields observed (
<xref ref-type="bibr" rid="B31">Leat and Woodhouse, 1984</xref>
)</td>
</tr>
<tr>
<td align="left" rowspan="1" colspan="1">Colored grating patches presented in the periphery caused strong onset biases that varied between individuals and across locations within an individual (
<xref ref-type="bibr" rid="B11">Carter and Cavanagh, 2007</xref>
). Areas of temporal hemifield dominance only became evident after matching each location for perceived brightness (
<xref ref-type="bibr" rid="B52">Stanley et al., 2011</xref>
)</td>
<td align="left" rowspan="1" colspan="1">No localized bias observed when brightness was not matched (
<xref ref-type="bibr" rid="B11">Carter and Cavanagh, 2007</xref>
). Not assessed in
<xref ref-type="bibr" rid="B52">Stanley et al. (2011)</xref>
after brightness matching</td>
</tr>
<tr>
<td align="left" rowspan="1" colspan="1">Onset bias shown for motion, house/face, and grating binocular rivalry. Individual observers exhibited right eye, left eye, or temporal hemifield bias, but no nasal hemifield bias (
<xref ref-type="bibr" rid="B26">Kalisvaart et al., 2011</xref>
)</td>
<td align="left" rowspan="1" colspan="1">No bias observed after 10sec of sustained viewing (
<xref ref-type="bibr" rid="B26">Kalisvaart et al., 2011</xref>
)</td>
</tr>
<tr>
<td align="left" rowspan="1" colspan="1">Eye movements</td>
<td align="left" rowspan="1" colspan="1">Retinal image shift renewed onset bias, but more so for stimulus shifts than saccades (
<xref ref-type="bibr" rid="B26">Kalisvaart et al., 2011</xref>
)</td>
<td align="left" rowspan="1" colspan="1">Not assessed as part of image shift experiment (
<xref ref-type="bibr" rid="B26">Kalisvaart et al., 2011</xref>
)</td>
</tr>
<tr>
<td align="left" rowspan="2" colspan="1">Contrast</td>
<td align="left" rowspan="1" colspan="1">Small imbalances in contrast caused exclusive dominance of higher-contrast image (
<xref ref-type="bibr" rid="B51">Song and Yao, 2009</xref>
)</td>
<td align="left" rowspan="1" colspan="1">Average dominance of a target increased gradually with larger contrast imbalances up to maximum imbalance ratio of 90:10 but exclusive dominance was not achieved (
<xref ref-type="bibr" rid="B51">Song and Yao, 2009</xref>
)</td>
</tr>
<tr>
<td align="left" rowspan="1" colspan="1">Minimizing contrast differences by matching brightness in each location for each observer unmasked other endogenous biases (
<xref ref-type="bibr" rid="B52">Stanley et al., 2011</xref>
)</td>
<td align="left" rowspan="1" colspan="1">Not assessed in
<xref ref-type="bibr" rid="B52">Stanley et al. (2011)</xref>
</td>
</tr>
<tr>
<td align="left" rowspan="2" colspan="1">Attention</td>
<td align="left" rowspan="1" colspan="1">Both exogenous (
<xref ref-type="bibr" rid="B40">Mitchell et al., 2004</xref>
;
<xref ref-type="bibr" rid="B14">Chong and Blake, 2006</xref>
) and endogenous (
<xref ref-type="bibr" rid="B14">Chong and Blake, 2006</xref>
) attention increased onset dominance of attended grating</td>
<td align="left" rowspan="1" colspan="1">Not assessed in
<xref ref-type="bibr" rid="B40">Mitchell et al. (2004)</xref>
or
<xref ref-type="bibr" rid="B14">Chong and Blake (2006)</xref>
</td>
</tr>
<tr>
<td align="left" rowspan="1" colspan="1">Effect of attention counteracted by reducing contrast of attention-boosted target 0.3 log-units (
<xref ref-type="bibr" rid="B14">Chong and Blake, 2006</xref>
)</td>
<td align="left" rowspan="1" colspan="1">Not assessed in
<xref ref-type="bibr" rid="B14">Chong and Blake (2006)</xref>
</td>
</tr>
<tr>
<td align="left" rowspan="2" colspan="1">Task relevance</td>
<td align="left" rowspan="1" colspan="1">Onset bias toward task-relevant grating; bias persisted even when grating was no longer task-relevant (
<xref ref-type="bibr" rid="B15">Chopin and Mamassian, 2010</xref>
)</td>
<td align="left" rowspan="1" colspan="1">No increase in average dominance of task-relevant grating (
<xref ref-type="bibr" rid="B15">Chopin and Mamassian, 2010</xref>
)</td>
</tr>
<tr>
<td align="left" rowspan="1" colspan="1">A spinning Necker cube was more likely to be seen as viewed from above when rotating on a vertical axis, and from the right when rotating on a horizontal axis on the left side of the screen. Authors suggest encoding of ecological relevance (
<xref ref-type="bibr" rid="B18">Dobbins and Grossmann, 2010</xref>
)</td>
<td align="left" rowspan="1" colspan="1">Some observers exhibited average dominance bias during 15-s presentation, though slow switch from biased dominance at onset may account for this result (
<xref ref-type="bibr" rid="B18">Dobbins and Grossmann, 2010</xref>
)</td>
</tr>
<tr>
<td align="left" rowspan="1" colspan="1">Context</td>
<td align="left" rowspan="1" colspan="1">Onset bias toward grating orientation that would match the next presentation in a preceding perceived rotation sequence (
<xref ref-type="bibr" rid="B17">Denison et al., in press</xref>
)</td>
<td align="left" rowspan="1" colspan="1">Not assessed in
<xref ref-type="bibr" rid="B17">Denison et al. (in press)</xref>
</td>
</tr>
<tr>
<td align="left" rowspan="2" colspan="1">Emotional salience</td>
<td align="left" rowspan="1" colspan="1">No significant bias toward emotionally arousing images (
<xref ref-type="bibr" rid="B49">Sheth and Pham, 2008</xref>
)</td>
<td align="left" rowspan="1" colspan="1">Greater average dominance of emotionally arousing images after 15sec of viewing (
<xref ref-type="bibr" rid="B49">Sheth and Pham, 2008</xref>
)</td>
</tr>
<tr>
<td align="left" rowspan="1" colspan="1">Observer’s anxiety level influences onset dominance of emotional faces: greater tendency to perceive angry faces and less tendency to perceive happy faces (
<xref ref-type="bibr" rid="B20">Gray et al., 2009</xref>
)</td>
<td align="left" rowspan="1" colspan="1">Not assessed in
<xref ref-type="bibr" rid="B20">Gray et al. (2009)</xref>
</td>
</tr>
</tbody>
</table>
<table-wrap-foot>
<fn id="T1fn01">
<label>*</label>
<p>Sustained effects reported here only refer to results obtained in the corresponding onset studies listed. Countless studies have been conducted using sustained rivalry, many of which show effects from the factors listed in this table, however, it is sometimes difficult to compare across paradigms, as multiple stimulus and procedural properties are likely to vary between studies. A number of detailed reviews of sustained rivalry have been published previously (
<xref ref-type="bibr" rid="B3">Blake and Logothetis, 2002</xref>
;
<xref ref-type="bibr" rid="B38">Long and Toppino, 2004</xref>
;
<xref ref-type="bibr" rid="B56">Tong et al., 2006</xref>
;
<xref ref-type="bibr" rid="B5">Blake and Wilson, 2011</xref>
). Also not listed in the table are studies that use an intermittent presentation paradigm. For a review of these studies see
<xref ref-type="bibr" rid="B46">Pearson and Brascamp (2008)</xref>
.</p>
</fn>
</table-wrap-foot>
</table-wrap>
</sec>
<sec>
<title>ONSET DOMINANCE DISTINCT FROM PERCEPTUAL MEMORY</title>
<p>As the focus of this review is the factors influencing perceptual dominance at stimulus onset, it is important to also clarify how onset dominance relates to the influence of perceptual memory demonstrated by intermittent stimulus paradigms (for review see
<xref ref-type="bibr" rid="B46">Pearson and Brascamp, 2008</xref>
). When rivaling images are presented and removed every few seconds, percept switching slows and dominance can appear to stabilize, with each new presentation of rivalry more likely to display the same dominant percept as the one last seen (
<xref ref-type="bibr" rid="B34">Leopold et al., 2002</xref>
). Importantly, while dominance periods lengthen considerably under these conditions, perceptual dominance does continue to alternate, maintaining approximately equal average dominance between the two possible percepts (
<xref ref-type="bibr" rid="B7">Brascamp et al., 2009</xref>
).</p>
<p>This pattern of dominance is quite distinct from the localized onset biases that are the focus of the current review. When stimuli are presented intermittently in the same location of the visual field, the initial dominance at each
<italic>repeated </italic>
presentation is most likely to be consistent with the perceptual state during the last presentation (
<xref ref-type="bibr" rid="B46">Pearson and Brascamp, 2008</xref>
). This “perceptual memory trace” appears to build up and disappear over each stimulus presentation and removal period such that it takes multiple presentation cycles for a perceptual reversal to be triggered (
<xref ref-type="bibr" rid="B6">Brascamp et al., 2008</xref>
;
<xref ref-type="bibr" rid="B45">Pastukhov and Braun, 2008</xref>
). In contrast, in the absence of perceptual memory—with greater than 10-s intervals between stimulus presentations (
<xref ref-type="bibr" rid="B11">Carter and Cavanagh, 2007</xref>
) or after stimulus shifts (
<xref ref-type="bibr" rid="B26">Kalisvaart et al., 2011</xref>
;
<xref ref-type="bibr" rid="B52">Stanley et al., 2011</xref>
)—onset biases for an individual are stable across weeks. Furthermore, in the relatively rare event that onset dominance does switch to the “non-predominant” target, the switch does not stabilize consistent with a “memory” of the new target, but quickly reverts back to the target that is most typically dominant in that area on subsequent presentations (
<xref ref-type="bibr" rid="B11">Carter and Cavanagh, 2007</xref>
;
<xref ref-type="bibr" rid="B52">Stanley et al., 2011</xref>
).</p>
<p>Based on the current literature, therefore, there is little doubt that onset rivalry and perceptual memory are clearly distinct phenomena. It is less clear however, whether the two are completely independent. One alternative is that perceptual history is simply one factor, like monocular dominance, that can sometimes have a powerful effect at rivalry onset. Given that onset rivalry is evident with a 1 sec on, 9 sec off paradigm (
<xref ref-type="bibr" rid="B11">Carter and Cavanagh, 2007</xref>
;
<xref ref-type="bibr" rid="B52">Stanley et al., 2011</xref>
) and perceptual memory is typically observed when stimuli are on for 3 sec and off for 5 sec (
<xref ref-type="bibr" rid="B34">Leopold et al., 2002</xref>
), one would expect that the relative distinction between the two phenomena would be reduced by decreasing or increasing the interval between stimulus onsets respectively. While it is clear that perceptual memory cannot account for the onset biases observed after longer interstimulus intervals, more research is needed to tease apart these two paradigms. At least one study has demonstrated a degree of interaction between endogenous onset biases and non-local perceptual memory.
<xref ref-type="bibr" rid="B30">Knapen et al. (2009)</xref>
has shown that the degree to which perceptual memory can transfer to peripheral locations can be increased if the stimulus is adjusted to account for local onset biases. Future research into onset rivalry or perceptual memory should therefore guard against confounding of the two paradigms—repeated trials intended to examine onset rivalry may begin to engage perceptual memory, and onset biases may also interact to weaken the influence of perceptual memory during intermittent presentations.</p>
</sec>
<sec>
<title>MODELS OF RIVALRY</title>
<p>A few models of binocular rivalry have been extended to include the role of perceptual memory when stimuli are first presented after a blank period (
<xref ref-type="bibr" rid="B44">Noest et al., 2007</xref>
;
<xref ref-type="bibr" rid="B63">Wilson, 2007</xref>
). So far, however, these models have only focused on the initial dominance in an intermittent presentation paradigm as described above, and do not yet account for the endogenous biases and sensitivity that are apparent when stimuli are first presented to the retina and no perceptual history is available. These models do predict that even very small input imbalances can dictate dominance in intermittent presentation (
<xref ref-type="bibr" rid="B44">Noest et al., 2007</xref>
;
<xref ref-type="bibr" rid="B29">Klink et al., 2008</xref>
). However, whether this aspect of the model will be able to fully explain the sensitivities of onset dominance has yet to be explicitly explored. Other commonly cited models of rivalry focus primarily on the stochastic alternation of percepts during sustained viewing, and describe mutual inhibition and adaptation at several levels of the visual hierarchy (
<xref ref-type="bibr" rid="B56">Tong et al., 2006</xref>
;
<xref ref-type="bibr" rid="B53">Sterzer and Rees, 2008</xref>
), or refer to Bayesian (
<xref ref-type="bibr" rid="B54">Sundareswara and Schrater, 2008</xref>
), predictive coding (
<xref ref-type="bibr" rid="B23">Hohwy et al., 2008</xref>
), or random and noise effects (
<xref ref-type="bibr" rid="B8">Brascamp et al., 2006</xref>
;
<xref ref-type="bibr" rid="B28">Kim et al., 2006</xref>
;
<xref ref-type="bibr" rid="B41">Moreno-Bote et al., 2007</xref>
). Such models of traditional rivalry do not yet distinguish between the mechanisms underlying the onset phase and those that drive subsequent switching. They also do not attempt to explain the consistency of the strong biases seen at onset, or the variation in these biases observed across the visual field. Such findings suggest that models of rivalry may need to take into account the particular physiology of an individual observer as well as perceptual history.</p>
<p>A formal model of onset rivalry is yet to be proposed. However, the biases and heightened sensitivities at the onset of rivalry might be partly explained by a model in which slight differences in signal strength result in latency differences between information coming from the same area of each eye. These disparities may allow one percept to “win the race,” either by reaching a relevant anatomical destination earlier or by attaining a required activation threshold more quickly. In such a race model, the winning signal will then become the exclusive conscious percept until the competing neural representation is similarly established. It is frequently proposed that rivalry depends on a degree of mutual inhibition that builds up over time between competing neural representations (for review see
<xref ref-type="bibr" rid="B3">Blake and Logothetis, 2002</xref>
). It would follow, therefore, that a perceptual switch could not begin until both neural representations had indeed become established. If this model were true, any small imbalances in the speed of the incoming signals would only be relevant at the point of stimulus onset, and would cease to be relevant once the competitive processes dictating sustained rivalry switching had begun. Of course, more focused research is needed to determine the neural areas or physiological processes that govern the initial processing of ambiguous visual input, such as pinpointing the “destination” or mechanisms within the brain that allow such conscious perception to first be decided. Further research is also required to determine how the mechanisms associated with onset rivalry relate to those involved in the initial fusion period reported with very brief (100 ms) presentations or to those associated with sustained rivalry paradigms.</p>
<p>It may turn out that onset and sustained rivalry involve identical mechanisms that differ in the degree to which they are influenced by certain factors. An extreme alternative that should also be considered, however, is that onset rivalry is closer to other forms of visual suppression such as “masking” (
<xref ref-type="bibr" rid="B9">Breitmeyer, 1984</xref>
). For example, the extent to which the suppressed image is represented in visual cortical regions might either be considerably reduced or completely distinct from the neural representations of suppression during sustained rivalry conditions. Although electroencephalography studies have been conducted using intermittent paradigms (for review see
<xref ref-type="bibr" rid="B47">Pitts and Britz, 2011</xref>
), no brain imaging or electrophysiological study of onset rivalry has been conducted to date. However, intracranial recording from early visual cortex shows the representations of suppressed stimuli which are seen during sustained rivalry presentation are not observable during the initial period of perceptual suppression after stimulus onset (personal communication with Tsuchiya—see also
<xref ref-type="bibr" rid="B57">Tsuchiya et al., 2011</xref>
). If the level of suppression seen at stimulus onset is indeed greater than the suppression associated with sustained rivalry, this may have implications for studies using continuous flash suppression (CFS). In CFS the image in one eye can be suppressed for minutes at a time by presenting the other eye with constantly changing, contour rich, and high contrast stimulation (
<xref ref-type="bibr" rid="B58">Tsuchiya and Koch, 2005</xref>
). The non-dominant image in CFS is also suppressed more deeply than in conventional rivalry (
<xref ref-type="bibr" rid="B59">Tsuchiya et al., 2006</xref>
). If the perceptual stability seen in CFS is effectively caused by the continual updating of the “onset state” due to the successive presentation of a new image to one of the two eyes, it is possible that the level of activation achieved by the suppressed image at onset will be overestimated or underestimated relative to that which might have been seen with a sustained rivalry paradigm. This concept of refreshing was raised by
<xref ref-type="bibr" rid="B58">Tsuchiya and Koch (2005</xref>
—supplementary material), however, at the time no distinction had been made between onset rivalry and sustained rivalry. Within this context, the persisting dominance period was conceptualized as a prolongation of a normal sustained rivalry state being repeatedly “refreshed,” rather than resetting of the distinct state characteristic of onset rivalry. Further investigation is required to determine how onset rivalry, in which rivaling targets are presented simultaneously, is related to paradigms such as flash suppression and masking, in which stimuli are presented asynchronously.</p>
</sec>
<sec>
<title>CONSEQUENCES FOR PAST MODELS AND FUTURE RESEARCH</title>
<p>Although there is much more research required to determine how various individual differences and stimulus conditions interact at the onset of rivalry, it is clear that the initial period of dominance must be distinguished from subsequent periods in rivalry. This distinction has implications for both past and future research into perceptual rivalry. Firstly, as the normal visual environment is constantly changing due to the dynamic nature of the external scenery and rapid and continuous natural saccadic eye movements (
<xref ref-type="bibr" rid="B22">Henderson and Hollingworth, 1998</xref>
), the mechanisms underlying the first interpretation of an ambiguous visual scene are likely to be most relevant for understanding conscious visual perception in a natural environment. The observation that dominance in rivalry after a saccade appears to be heavily related to the onset bias (
<xref ref-type="bibr" rid="B26">Kalisvaart et al., 2011</xref>
) further suggests that onset rivalry paradigms are likely to provide the greatest insight into how the brain deals with ambiguity in natural viewing conditions.</p>
<p>In contrast, brief presentation paradigms may be less suitable for investigating the alternating periods of dominance that characterize sustained rivalry. As this review has shown, endogenous factors and stimulus features affect dominance differently at onset than during sustained rivalry. Experimental conditions intending to investigate rivalry switching may exhibit different effects depending on the period of rivalry that is examined. Even paradigms that last for several seconds may still be influenced by onset biases, particularly for observers with naturally slower switch rates (
<xref ref-type="bibr" rid="B18">Dobbins and Grossmann, 2010</xref>
). With this caveat in mind, one might consider the possibility that it is the first switch, rather than the first conscious dominant percept, that marks the commencement of traditional, sustained rivalry. Indeed, the underlying mechanisms governing onset dominance appear to be unrelated to the initiation of transitional “suppression waves” that typically characterize a change in dominance (
<xref ref-type="bibr" rid="B61">van Ee, 2011</xref>
).</p>
<p>As a final caution, the literature reviewed here suggests that care is needed when interpreting data using intermittent presentations involving multiple repeated stimulus onsets—such as perceptual memory paradigms or CFS. It is likely that factors specific to onset rivalry may interfere with intermittent presentations aimed at investigating longer-term aspects of perceptual competition. Similarly, effects of past stimulus history are likely to influence onset dominance if testing involves multiple repeated trials.</p>
</sec>
<sec>
<title>CONCLUSION</title>
<p>Perceptual rivalry is a valuable tool for investigating the neural processes underlying perceptual awareness. The complexity in the time course of rivalry can also shed light on the brain’s mechanism for dealing with ambiguity in everyday environments. As the average fixation period in natural viewing is approximately 300 ms (
<xref ref-type="bibr" rid="B22">Henderson and Hollingworth, 1998</xref>
), an individual’s initial perceptual experience is likely to be the most relevant in everyday encounters with rivaling visual input. Current data cannot distinguish whether onset and sustained rivalry are determined by completely distinct mechanisms or share mechanisms that are nevertheless influenced by a range of factors in quite distinct ways. For example, dominance at onset appears to be particularly sensitive to early visual factors such as contrast and ocular dominance, while the role of higher cognitive factors is less clear. Additional work is needed to explore the interaction between onset and sustained rivalry in hybrid paradigms like intermittent presentation and continuous flash suppression, which involve repeated onset presentations in rapid succession.</p>
</sec>
<sec>
<title>Conflict of Interest Statement</title>
<p>Conflict of Interest Statement: The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.</p>
</sec>
</body>
<back>
<ack>
<p>This work was supported by a National Health Medical Research Council of Australia Career Development Award [#628590] to Olivia Carter and by grants from an ANR Chaire d’Excellence and NIH EY009258 to Patrick Cavanagh.</p>
</ack>
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