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Appears in Collections:Psychology Journal Articles
Peer Review Status: Refereed
Title: Binocular properties of curvature-encoding mechanisms revealed through two shape after-effects
Authors: Gheorghiu, Elena
Kingdom, Frederick A A
Thai, Minh-Thu
Sampasivam, Lavanya
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Keywords: Binocular
Issue Date: Jul-2009
Publisher: Elsevier
Citation: Gheorghiu E, Kingdom FAA, Thai M & Sampasivam L (2009) Binocular properties of curvature-encoding mechanisms revealed through two shape after-effects, Vision Research, 49 (14), pp. 1765-1774.
Abstract: We investigated the binocular properties of curvature-encoding mechanisms using the shape-frequency and shape-amplitude after-effects (or SFAE and SAAE). The SFAE and SAAE refer to the shifts observed in, respectively, the shape-frequency and shape-amplitude of a sinusoidal test contour following adaptation to a contour with different shape-frequency/shape-amplitude. We examined (i) the contribution of monocular versus binocular mechanisms to the SFAE and SAAE by measuring the interocular transfer of these after-effects, (ii) the stereo-depth selectivity of the after-effects and (iii) the depth selectivity of the reduction in the after-effects from texture-surround inhibition. Our results reveal that (i) both SFAE and SAAE have a high degree of interocular transfer (on average greater than 90%), suggesting that they are mediated primarily by binocular mechanisms, (ii) neither SFAE nor SAAE are selective to stereo-defined depth and (iii) the reduction in the SFAE and SAAE from texture-surround inhibition is selective for stereo-depth. We conclude that the SFAE and SAAE are mediated by binocularly driven curvature-selective neurons that are not disparity selective in themselves but which receive inputs from neurons that are subject to depth- and orientation-selective texture-surround inhibition.
Type: Journal Article
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Affiliation: Psychology
McGill University
McGill University
McGill University

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