December 2001
Volume 1, Issue 3
Free
Vision Sciences Society Annual Meeting Abstract  |   December 2001
Color and orientation pop-outs differentially affect discrimination
Author Affiliations
  • Bhavin R. Sheth
    California Institute of Technology, Pasadena, CA, USA
  • Shinsuke Shimojo
    California Institute of Technology, Pasadena, CA, USA
Journal of Vision December 2001, Vol.1, 115. doi:10.1167/1.3.115
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      Bhavin R. Sheth, Shinsuke Shimojo; Color and orientation pop-outs differentially affect discrimination. Journal of Vision 2001;1(3):115. doi: 10.1167/1.3.115.

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Abstract

Visual properties such as orientation, color and luminance are functionally similar in that each of them individually provide a basis for perceptual pop-out (Treisman & Gelade, 1980). Pop-outs are commonly believed to facilitate information processing in a variety of tasks such as detection (Bravo & Nakayama, 1992) and discrimination. Here, we show a special case in which all pop-outs do not facilitate discrimination. A 3 × 3 matrix of (vertically or horizontally) oriented grating patches is shown (followed by a matrix of plaid masks) either in the periphery (10 deg. eccentricity, 1 × 1 deg. area each, 180–300 ms duration) or in the fovea (0.5 × 0.5 deg. area each, 5 ms duration). The observer (n=5 throughout) discriminates the central target's color or orientation. If the target is a unique color, discrimination improves compared to a control in which all items are of the same color. Conversely, if the target's orientation is salient, discrimination does not improve but deteriorates compared to a no-orientation pop-out control. If luminance is substituted for color, the effect is similar. There are no attentional differences between conditions. Color does not pop out more than orientation. Phenomenologically, the data show real differences between so-called elementary visual properties (Nothdurft, 1993; Wolfe et al., 1993). Though counterintuitive, a greater degree of suppression by an orthogonally oriented surround as compared to an iso-oriented one and relatively little suppression of a uniquely colored stimulus by the surround can explain the data. This poses new challenges for physiology and computation (Fitzpatrick, 2000).

Sheth, B.R., Shimojo, S.(2001). Color and orientation pop-outs differentially affect discrimination [Abstract]. Journal of Vision, 1( 3): 115, 115a, http://journalofvision.org/1/3/115/, doi:10.1167/1.3.115. [CrossRef]
Footnotes
 B.R.S. was supported by a Division of Biology, Caltech fellowship.
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