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

Andrew Schofield, Paul B. Rock, Peng Sun, Xiaoyue Jiang, Mark A. Georgeson

Research output: Contribution to journalArticle

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 benet 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. © ARVO.

Original languageEnglish
Article number2
JournalJournal of Vision
Volume10
Issue number9
DOIs
Publication statusPublished - 16 Jul 2010

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Keywords

  • 3D surface and shape perception
  • computational modeling
  • shading
  • spatial vision

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Schofield, Andrew ; Rock, Paul B. ; Sun, Peng ; Jiang, Xiaoyue ; Georgeson, Mark A. / What is second-order vision for? Discriminating illumination versus material changes. In: Journal of Vision. 2010 ; Vol. 10, No. 9.
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What is second-order vision for? Discriminating illumination versus material changes. / Schofield, Andrew; Rock, Paul B.; Sun, Peng; Jiang, Xiaoyue; Georgeson, Mark A.

In: Journal of Vision, Vol. 10, No. 9, 2, 16.07.2010.

Research output: Contribution to journalArticle

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