HapticV1, Ncbi, Merge, bibRecord, 001718

What is second-order vision for? Discriminating illumination versus material changes.

Identifieur interne : 001718 ( Ncbi/Merge ); précédent : 001717; suivant : 001719

What 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. Georgeson

Source :

Journal of vision [ 1534-7362 ] ; 2010.

RBID : pubmed:20884600

English descriptors

KwdEn :
- Contrast Sensitivity (physiology), Cues, Depth Perception (physiology), Discrimination (Psychology) (physiology), Humans, Lighting, Models, Neurological, Orientation (physiology), Photic Stimulation (methods), Surface Properties.
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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Le document en format XML

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<author><name sortKey="Schofield, Andrew J" sort="Schofield, Andrew J" uniqKey="Schofield A" first="Andrew J" last="Schofield">Andrew J. Schofield</name>
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<author><name sortKey="Georgeson, Mark A" sort="Georgeson, Mark A" uniqKey="Georgeson M" first="Mark A" last="Georgeson">Mark A. Georgeson</name>
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<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>
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<Abstract><AbstractText>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.</AbstractText>
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What is second-order vision for? Discriminating illumination versus material changes.

What is second-order vision for? Discriminating illumination versus material changes.

Source :

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

Links to Exploration step

Le document en format XML

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