Contour inflections are adaptable features.
Identifieur interne : 001A89 ( Ncbi/Checkpoint ); précédent : 001A88; suivant : 001A90Contour inflections are adaptable features.
Auteurs : Jason Bell [Canada] ; Sinthujaa Sampasivam [Canada] ; David P. Mcgovern [Irlande (pays)] ; Andrew Isaac Meso [France] ; Frederick A A. Kingdom [Canada]Source :
- Journal of vision [ 1534-7362 ] ; 2014.
Descripteurs français
- KwdFr :
- MESH :
English descriptors
- KwdEn :
- MESH :
- physiology : Adaptation, Physiological, Figural Aftereffect, Form Perception.
- Cues, Female, Humans, Male, Orientation, Photic Stimulation.
Abstract
An object's shape is a strong cue for visual recognition. Most models of shape coding emphasize the role of oriented lines and curves for coding an object's shape. Yet inflection points, which occur at the junction of two oppositely signed curves, are ubiquitous features in natural scenes and carry important information about the shape of an object. Using a visual aftereffect in which the perceived shape of a contour is changed following prolonged viewing of a slightly different-shaped contour, we demonstrate a specific aftereffect for a contour inflection. Control conditions show that this aftereffect cannot be explained by adaptation to either the component curves or to the local orientation at the point of inflection. Further, we show that the aftereffect transfers weakly to a compound curve without an inflection, ruling out a general compound curvature detector as an explanation of our findings. We assume however that there are adaptable mechanisms for coding other specific forms of compound curves. Taken together, our findings provide evidence that the human visual system contains specific mechanisms for coding contour inflections, further highlighting their role in shape and object coding.
DOI: 10.1167/14.7.2
PubMed: 24893785
Affiliations:
- Canada, France, Irlande (pays)
- Provence-Alpes-Côte d'Azur, Québec
- Marseille, Montréal
- Université McGill
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pubmed:24893785Le document en format XML
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Most models of shape coding emphasize the role of oriented lines and curves for coding an object's shape. Yet inflection points, which occur at the junction of two oppositely signed curves, are ubiquitous features in natural scenes and carry important information about the shape of an object. Using a visual aftereffect in which the perceived shape of a contour is changed following prolonged viewing of a slightly different-shaped contour, we demonstrate a specific aftereffect for a contour inflection. Control conditions show that this aftereffect cannot be explained by adaptation to either the component curves or to the local orientation at the point of inflection. Further, we show that the aftereffect transfers weakly to a compound curve without an inflection, ruling out a general compound curvature detector as an explanation of our findings. We assume however that there are adaptable mechanisms for coding other specific forms of compound curves. Taken together, our findings provide evidence that the human visual system contains specific mechanisms for coding contour inflections, further highlighting their role in shape and object coding.</div></front></TEI><affiliations><list><country><li>Canada</li><li>France</li><li>Irlande (pays)</li></country><region><li>Provence-Alpes-Côte d'Azur</li><li>Québec</li></region><settlement><li>Marseille</li><li>Montréal</li></settlement><orgName><li>Université McGill</li></orgName></list><tree><country name="Canada"><noRegion><name sortKey="Bell, Jason" sort="Bell, Jason" uniqKey="Bell J" first="Jason" last="Bell">Jason Bell</name></noRegion><name sortKey="Kingdom, Frederick A A" sort="Kingdom, Frederick A A" uniqKey="Kingdom F" first="Frederick A A" last="Kingdom">Frederick A A. Kingdom</name><name sortKey="Sampasivam, Sinthujaa" sort="Sampasivam, Sinthujaa" uniqKey="Sampasivam S" first="Sinthujaa" last="Sampasivam">Sinthujaa Sampasivam</name></country><country name="Irlande (pays)"><noRegion><name sortKey="Mcgovern, David P" sort="Mcgovern, David P" uniqKey="Mcgovern D" first="David P" last="Mcgovern">David P. Mcgovern</name></noRegion></country><country name="France"><region name="Provence-Alpes-Côte d'Azur"><name sortKey="Meso, Andrew Isaac" sort="Meso, Andrew Isaac" uniqKey="Meso A" first="Andrew Isaac" last="Meso">Andrew Isaac Meso</name></region></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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