Please use this identifier to cite or link to this item: http://hdl.handle.net/1893/20539
Appears in Collections:Psychology Journal Articles
Peer Review Status: Refereed
Title: Chromatic tuning of contour-shape mechanisms revealed through the shape-frequency and shape-amplitude after-effects
Authors: Gheorghiu, Elena
Kingdom, Frederick A A
Contact Email: elena.gheorghiu@stir.ac.uk
Keywords: Color
Contrast-polarity
Shape
Adaptation
Shape-frequency after-effect
Shape-amplitude after-effect
Issue Date: Jun-2007
Publisher: Elsevier
Citation: Gheorghiu E & Kingdom FAA (2007) Chromatic tuning of contour-shape mechanisms revealed through the shape-frequency and shape-amplitude after-effects, Vision Research, 47 (14), pp. 1935-1949.
Abstract: We investigated whether contour-shape processing mechanisms are selective for color direction using the shape-frequency and shape-amplitude after-effects, or SFAE and SAAE [Gheorghiu, E. & Kingdom, F. A. A. (2006). Luminance-contrast properties of contour-shape processing revealed through the shape-frequency after-effect. Vision Research, 46(21), 3603-3615. Gheorghiu, E. & Kingdom, F. A. A. (2007). The spatial feature underlying the shape-frequency and shape-amplitude after-effects. Vision Research, 47(6), 834-844]. All contours were defined along the 'red-green', 'blue-yellow' and 'luminance' axes of cardinal color space. Adapting and test contours were defined along the same or along opposite polarities within a cardinal axis, and along the same or along different cardinal axes. We found (i) little transfer of the after-effects across different within-axis polarities, for all cardinal axes and for both even-symmetric and odd-symmetric contours; (ii) little transfer between the red-green and blue-yellow cardinal axes; (iii) little transfer between the chromatic and luminance cardinal directions for the SAAE; (iv) large transfer between the chromatic and luminance cardinal directions for the SFAE. We conclude that contour-shape mechanisms are selective for within-cardinal axis polarity and for the chromatic axes within the isoluminant plane. However for certain types of contour-shape processing they are poorly selective along the chromatic versus luminance dimension. Overall our results suggest that contour-shape encoding mechanisms are selective for color direction and that color is important for contour-shape processing.
Type: Journal Article
URI: http://hdl.handle.net/1893/20539
DOI Link: http://dx.doi.org/10.1016/j.visres.2007.03.010
Rights: The publisher does not allow this work to be made publicly available in this Repository. Please use the Request a Copy feature at the foot of the Repository record to request a copy directly from the author. You can only request a copy if you wish to use this work for your own research or private study.
Affiliation: Psychology
McGill University

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