Human perception of shape from touch
Identifieur interne : 001513 ( Pmc/Curation ); précédent : 001512; suivant : 001514Human perception of shape from touch
Auteurs : Astrid M. L. KappersSource :
- Philosophical Transactions of the Royal Society B: Biological Sciences [ 0962-8436 ] ; 2011.
Abstract
In this paper, I focus on the role of active touch in three aspects of shape perception and discrimination studies. First an overview is given of curvature discrimination experiments. The most prominent result is that first-order stimulus information (that is, the difference in attitude or slope over the stimulus) is the dominant factor determining the curvature threshold. Secondly, I compare touch under bimanual and two-finger performance with unimanual and one-finger performance. Consistently, bimanual or two-finger performance turned out to be worse. The most likely explanation for the former finding is that a loss of accuracy during intermanual comparisons is owing to interhemispheric relay. Thirdly, I address the presence of strong after-effects after just briefly touching a shape. These after-effects have been measured and studied in various conditions (such as, static, dynamic, transfer to other hand or finger). Combination of the results of these studies leads to the insight that there are possibly different classes of after-effect: a strong after-effect, caused by immediate contact with the stimulus, that does only partially transfer to the other hand, and one much less strong after-effect, caused by moving over the stimulus for a certain period, which shows a full transfer to other fingers.
Url:
DOI: 10.1098/rstb.2011.0171
PubMed: 21969692
PubMed Central: 3172608
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<front><div type="abstract" xml:lang="en"><p>In this paper, I focus on the role of active touch in three aspects of shape perception and discrimination studies. First an overview is given of curvature discrimination experiments. The most prominent result is that first-order stimulus information (that is, the difference in attitude or slope over the stimulus) is the dominant factor determining the curvature threshold. Secondly, I compare touch under bimanual and two-finger performance with unimanual and one-finger performance. Consistently, bimanual or two-finger performance turned out to be worse. The most likely explanation for the former finding is that a loss of accuracy during intermanual comparisons is owing to interhemispheric relay. Thirdly, I address the presence of strong after-effects after just briefly touching a shape. These after-effects have been measured and studied in various conditions (such as, static, dynamic, transfer to other hand or finger). Combination of the results of these studies leads to the insight that there are possibly different classes of after-effect: a strong after-effect, caused by immediate contact with the stimulus, that does only partially transfer to the other hand, and one much less strong after-effect, caused by moving over the stimulus for a certain period, which shows a full transfer to other fingers.</p>
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<front><journal-meta><journal-id journal-id-type="nlm-ta">Philos Trans R Soc Lond B Biol Sci</journal-id>
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<title-group><article-title>Human perception of shape from touch</article-title>
<alt-title alt-title-type="short">Shape from touch</alt-title>
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<contrib-group><contrib contrib-type="author"><name><surname>Kappers</surname>
<given-names>Astrid M. L.</given-names>
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<xref ref-type="corresp" rid="cor1">*</xref>
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<aff><addr-line>Helmholtz Instituut, Physics of Man, Padualaan 8, 3584 CH Utrecht, The Netherlands</addr-line>
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<author-notes><corresp id="cor1"><label>*</label>
<email>a.m.l.kappers@uu.nl</email>
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<fn fn-type="other"><p>One contribution of 18 to a Theo Murphy Meeting Issue ‘<ext-link ext-link-type="uri" xlink:href="http://rstb.royalsocietypublishing.org/content/366/1581.toc">Active touch sensing</ext-link>
’.</p>
</fn>
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<pub-date pub-type="ppub"><day>12</day>
<month>11</month>
<year>2011</year>
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<volume>366</volume>
<issue>1581</issue>
<issue-title>Theo Murphy Meeting issue 'Active touch sensing' organized and edited by Tony J. Prescott, Mathew E. Diamond and Alan Wing</issue-title>
<fpage>3106</fpage>
<lpage>3114</lpage>
<permissions><copyright-statement>This journal is © 2011 The Royal Society</copyright-statement>
<copyright-year>2011</copyright-year>
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<self-uri content-type="pdf" xlink:type="simple" xlink:href="rstb20110171.pdf"></self-uri>
<abstract><p>In this paper, I focus on the role of active touch in three aspects of shape perception and discrimination studies. First an overview is given of curvature discrimination experiments. The most prominent result is that first-order stimulus information (that is, the difference in attitude or slope over the stimulus) is the dominant factor determining the curvature threshold. Secondly, I compare touch under bimanual and two-finger performance with unimanual and one-finger performance. Consistently, bimanual or two-finger performance turned out to be worse. The most likely explanation for the former finding is that a loss of accuracy during intermanual comparisons is owing to interhemispheric relay. Thirdly, I address the presence of strong after-effects after just briefly touching a shape. These after-effects have been measured and studied in various conditions (such as, static, dynamic, transfer to other hand or finger). Combination of the results of these studies leads to the insight that there are possibly different classes of after-effect: a strong after-effect, caused by immediate contact with the stimulus, that does only partially transfer to the other hand, and one much less strong after-effect, caused by moving over the stimulus for a certain period, which shows a full transfer to other fingers.</p>
</abstract>
<kwd-group><kwd>shape perception</kwd>
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<kwd>haptic perception</kwd>
<kwd>bimanual</kwd>
<kwd>unimanual</kwd>
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