June 2006
Volume 6, Issue 6
Free
Vision Sciences Society Annual Meeting Abstract  |   June 2006
Evidence for plaid-grabbers
Author Affiliations
  • Charles Chubb
    Department of Cognitive Sciences, UC Irvine, Irvine, CA 92697-5100
  • Joshua A. Solomon
    Optometry Dept., City University, London EC1V 0HB
  • Michael J. Morgan
    Optometry Dept., City University, London EC1V 0HB
Journal of Vision June 2006, Vol.6, 201. doi:10.1167/6.6.201
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      Charles Chubb, Joshua A. Solomon, Michael J. Morgan; Evidence for plaid-grabbers. Journal of Vision 2006;6(6):201. doi: 10.1167/6.6.201.

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Abstract

We wondered whether plaids activate preattentive mechanisms distinct from those activated by their component gratings. Observers searched for a target plaid—the sum of two perpendicular components in a circular window (radius = 0.65 deg). The target was present on half the trials. On target-present trials, approximately half of the three or seven distractors were one component (frequency f1), the rest were the other component (frequency f2). Target and distractors were evenly arrayed on a circle (radius 2.36 deg) around fixation. Target and distractor contrasts were randomly perturbed. When f1 = 2 c/d and f2 = 5.25 c/d, reaction times increased with the number of distractors (15.75 ms/item). When f1 = f2 = 5.25 c/d, the set-size effect was much smaller (2.35 ms/item). When f1 = f2 = 2.00 c/d, reaction times did not increase with the number of distractors. These results suggest the existence of “plaid-grabbers”: preattentive, plaid sensitive mechanisms with bandlimited input that do not respond to individual plaid components.

Chubb, C. Solomon, J. A. Morgan, M. J. (2006). Evidence for plaid-grabbers [Abstract]. Journal of Vision, 6(6):201, 201a, http://journalofvision.org/6/6/201/, doi:10.1167/6.6.201. [CrossRef]
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