Please use this identifier to cite or link to this item: http://hdl.handle.net/1893/20536
Appears in Collections:Psychology Journal Articles
Peer Review Status: Refereed
Title: Size and shape after-effects: Same or different mechanism?
Authors: Gheorghiu, Elena
Kingdom, Frederick A A
Witney, Emma
Contact Email: elena.gheorghiu@stir.ac.uk
Keywords: Contour
Curvature
Size
Adaptation
Shape
After-effect
Issue Date: Oct-2010
Publisher: Elsevier
Citation: Gheorghiu E, Kingdom FAA & Witney E (2010) Size and shape after-effects: Same or different mechanism?, Vision Research, 50 (21), pp. 2127-2136.
Abstract: The shape-frequency and shape-amplitude after-effects, or SFAE and SAAE, are shifts in the perceived shape-frequency and perceived shape-amplitude of a sinusoidal test contour following adaptation to a similar-shaped contour. These shape-effects are the shape analogs of the well-known size after-effect discovered by Blakemore and Sutton (1969), so it is possible that they are mediated by a size-sensitive mechanism. We tested this possibility by comparing the magnitudes of SFAEs/SAAEs elicited by contour/edge adaptors with those from luminance grating and line-grating adaptors. The rationale was that if the shape after-effects using the two classes of adaptors were similar, then they would likely be mediated by the same mechanism. We found that the SFAE and SAAE were greatly reduced when using luminance and line grating adaptors, suggesting that the SFAE and SAAE are not mediated primarily by either first- or second-order size-sensitive mechanisms. Based on previous studies we conclude that SFAEs/SAAEs are mediated by mechanisms primarily sensitive to curvature.
Type: Journal Article
URI: http://hdl.handle.net/1893/20536
DOI Link: http://dx.doi.org/10.1016/j.visres.2010.08.006
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
McGill University

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