Please use this identifier to cite or link to this item: http://hdl.handle.net/1893/20517
Appears in Collections:Psychology Journal Articles
Peer Review Status: Refereed
Title: Orientation tuning of curvature adaptation reveals both curvature-polarity-selective and non-selective mechanisms
Authors: Bell, Jason
Gheorghiu, Elena
Kingdom, Frederick A A
Contact Email: elena.gheorghiu@stir.ac.uk
Keywords: contour
curvature
orientation
adaptation
shape
Issue Date: Nov-2009
Publisher: Association for Research in Vision and Ophthalmology
Citation: Bell J, Gheorghiu E & Kingdom FAA (2009) Orientation tuning of curvature adaptation reveals both curvature-polarity-selective and non-selective mechanisms, Journal of Vision, 9 (12), Art. No.: 3.
Abstract: We have used a curvature after-effect, or CAE, to explore whether curvature detectors are tuned for the overall orientation of a curve. CAEs were measured for half-cycle cosine-shaped contours as a function of adaptor contour orientation for a fixed test contour orientation. CAEs (i) were greatest when the adaptor and test contours had the same orientation, (ii) decreased rapidly as the orientation of the adapting contours rotated away from the test, the data being well fit by a Gaussian function with a standard deviation of 16°, (iii) increased again to a secondary peak when the adapting contours were rotated 180° relative to the test. Control experiments showed that the shape of the curvature-orientation tuning function could not be explained by local orientation adaptation, and that instead curvature encoding mechanisms are tuned for orientation. The secondary peak in the CAE at 180° is argued to be inconsistent with curvature opponency and instead a result of the combination of polarity-selective and polarity-non-selective curvature mechanisms. The results are discussed in relation to recent psychophysical and physiological models of form processing and the possible significance of the findings with regard to symmetry processing.
Type: Journal Article
URI: http://hdl.handle.net/1893/20517
DOI Link: http://dx.doi.org/10.1167/9.12.3
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: McGill University
Psychology
McGill University

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