What is second-order vision for? Discriminating illumination versus material changes.
Identifieur interne : 001718 ( Ncbi/Curation ); précédent : 001717; suivant : 001719What is second-order vision for? Discriminating illumination versus material changes.
Auteurs : Andrew J. Schofield [Royaume-Uni] ; Paul B. Rock ; Peng Sun ; Xiaoyue Jiang ; Mark A. GeorgesonSource :
- Journal of vision [ 1534-7362 ] ; 2010.
English descriptors
- KwdEn :
- MESH :
- methods : Photic Stimulation.
- physiology : Contrast Sensitivity, Depth Perception, Discrimination (Psychology), Orientation.
- Cues, Humans, Lighting, Models, Neurological, Surface Properties.
Abstract
The human visual system is sensitive to second-order modulations of the local contrast (CM) or amplitude (AM) of a carrier signal. Second-order cues are detected independently of first-order luminance signals; however, it is not clear why vision should benefit from second-order sensitivity. Analysis of the first- and second-order contents of natural images suggests that these cues tend to occur together, but their phase relationship varies. We have shown that in-phase combinations of LM and AM are perceived as a shaded corrugated surface whereas the anti-phase combination can be seen as corrugated when presented alone or as a flat material change when presented in a plaid containing the in-phase cue. We now extend these findings using new stimulus types and a novel haptic matching task. We also introduce a computational model based on initially separate first- and second-order channels that are combined within orientation and subsequently across orientation to produce a shading signal. Contrast gain control allows the LM + AM cue to suppress responses to the LM - AM when presented in a plaid. Thus, the model sees LM - AM as flat in these circumstances. We conclude that second-order vision plays a key role in disambiguating the origin of luminance changes within an image.
DOI: 10.1167/10.9.2
PubMed: 20884600
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Rock</name></author><author><name sortKey="Sun, Peng" sort="Sun, Peng" uniqKey="Sun P" first="Peng" last="Sun">Peng Sun</name></author><author><name sortKey="Jiang, Xiaoyue" sort="Jiang, Xiaoyue" uniqKey="Jiang X" first="Xiaoyue" last="Jiang">Xiaoyue Jiang</name></author><author><name sortKey="Georgeson, Mark A" sort="Georgeson, Mark A" uniqKey="Georgeson M" first="Mark A" last="Georgeson">Mark A. Georgeson</name></author></titleStmt><publicationStmt><idno type="wicri:source">PubMed</idno><date when="2010">2010</date><idno type="doi">10.1167/10.9.2</idno><idno type="RBID">pubmed:20884600</idno><idno type="pmid">20884600</idno><idno type="wicri:Area/PubMed/Corpus">001024</idno><idno type="wicri:Area/PubMed/Curation">001024</idno><idno type="wicri:Area/PubMed/Checkpoint">000E45</idno><idno type="wicri:Area/Ncbi/Merge">001718</idno><idno type="wicri:Area/Ncbi/Curation">001718</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en">What is second-order vision for? Discriminating illumination versus material changes.</title><author><name sortKey="Schofield, Andrew J" sort="Schofield, Andrew J" uniqKey="Schofield A" first="Andrew J" last="Schofield">Andrew J. Schofield</name><affiliation wicri:level="4"><nlm:affiliation>School of Psychology, University of Birmingham, Birmingham, UK. a.j.schofield@bham.ac.uk</nlm:affiliation><country xml:lang="fr">Royaume-Uni</country><wicri:regionArea>School of Psychology, University of Birmingham, Birmingham</wicri:regionArea><orgName type="university">Université de Birmingham</orgName><placeName><settlement type="city">Birmingham</settlement><region type="country">Angleterre</region><region type="région" nuts="1">Midlands de l'Ouest</region></placeName></affiliation></author><author><name sortKey="Rock, Paul B" sort="Rock, Paul B" uniqKey="Rock P" first="Paul B" last="Rock">Paul B. Rock</name></author><author><name sortKey="Sun, Peng" sort="Sun, Peng" uniqKey="Sun P" first="Peng" last="Sun">Peng Sun</name></author><author><name sortKey="Jiang, Xiaoyue" sort="Jiang, Xiaoyue" uniqKey="Jiang X" first="Xiaoyue" last="Jiang">Xiaoyue Jiang</name></author><author><name sortKey="Georgeson, Mark A" sort="Georgeson, Mark A" uniqKey="Georgeson M" first="Mark A" last="Georgeson">Mark A. Georgeson</name></author></analytic><series><title level="j">Journal of vision</title><idno type="eISSN">1534-7362</idno><imprint><date when="2010" type="published">2010</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Contrast Sensitivity (physiology)</term><term>Cues</term><term>Depth Perception (physiology)</term><term>Discrimination (Psychology) (physiology)</term><term>Humans</term><term>Lighting</term><term>Models, Neurological</term><term>Orientation (physiology)</term><term>Photic Stimulation (methods)</term><term>Surface Properties</term></keywords><keywords scheme="MESH" qualifier="methods" xml:lang="en"><term>Photic Stimulation</term></keywords><keywords scheme="MESH" qualifier="physiology" xml:lang="en"><term>Contrast Sensitivity</term><term>Depth Perception</term><term>Discrimination (Psychology)</term><term>Orientation</term></keywords><keywords scheme="MESH" xml:lang="en"><term>Cues</term><term>Humans</term><term>Lighting</term><term>Models, Neurological</term><term>Surface Properties</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">The human visual system is sensitive to second-order modulations of the local contrast (CM) or amplitude (AM) of a carrier signal. Second-order cues are detected independently of first-order luminance signals; however, it is not clear why vision should benefit from second-order sensitivity. Analysis of the first- and second-order contents of natural images suggests that these cues tend to occur together, but their phase relationship varies. We have shown that in-phase combinations of LM and AM are perceived as a shaded corrugated surface whereas the anti-phase combination can be seen as corrugated when presented alone or as a flat material change when presented in a plaid containing the in-phase cue. We now extend these findings using new stimulus types and a novel haptic matching task. We also introduce a computational model based on initially separate first- and second-order channels that are combined within orientation and subsequently across orientation to produce a shading signal. Contrast gain control allows the LM + AM cue to suppress responses to the LM - AM when presented in a plaid. Thus, the model sees LM - AM as flat in these circumstances. We conclude that second-order vision plays a key role in disambiguating the origin of luminance changes within an image.</div></front></TEI></record>Pour manipuler ce document sous Unix (Dilib)
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