October 2003
Volume 3, Issue 9
Free
Vision Sciences Society Annual Meeting Abstract  |   October 2003
Color-contingent orientation adaptation for unresolvable Gabor patches
Author Affiliations
  • Reza Rajimehr
    Department of Cognitive Neuroscience, School of Intelligent Systems (SIS), Institute for Studies in Theoretical Physics and Mathematics (IPM), Niavaran, Tehran, Iran
Journal of Vision October 2003, Vol.3, 605. doi:10.1167/3.9.605
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      Reza Rajimehr; Color-contingent orientation adaptation for unresolvable Gabor patches. Journal of Vision 2003;3(9):605. doi: 10.1167/3.9.605.

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Abstract

McCollough effect is an orientation-contingent color aftereffect in which adapting to differently colored gratings of different orientations produces negative color aftereffects contingent on bar orientation. In this study a ‘modified McCollough effect’ (color-contingent orientation adaptation) was introduced in order to evaluate the interactions between orientation and color in unresolvable patterns. At first orientation selective adaptation was examined for unresolvable Gabor patches. Adapting stimulus was a peripheral Gabor patch whose spatial frequency was beyond the perceptual resolution limit. Test stimulus was a low contrast thin line with either the same (‘same adapt-test’) or different (‘different adapt-test’) orientation with respect to the adapting Gabor patch. Results showed that although subjects were unable to discriminate the adapting orientation (the performance was at chance level), they discriminated the orientation of ‘different adapt-test’ more accurately than the orientation of ‘same adapt-test’. In the second experiment adaptation to colored (green or red) unresolvable Gabor patches was tested using low contrast colored resolvable Gabor patches as test stimuli. Results revealed that orientation selective adaptation existed only when the colors of adapting and test stimuli were identical (‘color-contingent orientation adaptation’). According to these results the interaction between orientation and color occurs during the ‘modified McCollough effect’ in probably V1 or higher cortical areas when subjects have no conscious access to the orientation of adapting stimulus.

Rajimehr, R.(2003). Color-contingent orientation adaptation for unresolvable Gabor patches [Abstract]. Journal of Vision, 3( 9): 605, 605a, http://journalofvision.org/3/9/605/, doi:10.1167/3.9.605. [CrossRef]
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