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Appears in Collections:Psychology Journal Articles
Peer Review Status: Refereed
Title: Global shape processing involves a hierarchy of integration stages
Authors: Bell, Jason
Gheorghiu, Elena
Hess, Robert F
Kingdom, Frederick A A
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Keywords: Contour
Issue Date: Aug-2011
Publisher: Elsevier
Citation: Bell J, Gheorghiu E, Hess RF & Kingdom FAA (2011) Global shape processing involves a hierarchy of integration stages, Vision Research, 51 (15), pp. 1760-1766.
Abstract: Radial Frequency (RF) patterns can be used to study the processing of familiar shapes, e.g. triangles and squares. Opinion is divided over whether the mechanisms that detect these shapes integrate local orientation and position information directly, or whether local orientations and positions are first combined to represent extended features, such as curves, and that it is local curvatures that the shape mechanism integrates. The latter view incorporates an intermediate processing stage, the former does not. To differentiate between these hypotheses we studied the processing of micro-patch sampled RF patterns as a function of the luminance polarity of successive elements on the contour path. Our first study measures shape after effects involving suprathreshold amplitude RF shapes and shows that alternating the luminance polarity of successive micro-patch elements disrupts adaptation of the global shape. Our second study shows that polarity alternations also disrupt sensitivity to threshold-amplitude RF patterns. These results suggest that neighbouring points of the contour shape are integrated into extended features by a polarity selective mechanism, prior to global shape processing, consistent with the view that for both threshold amplitude and suprathreshold amplitude patterns, global processing of RF shapes involves an intermediate stage of processing.
Type: Journal Article
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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
University of Cambridge
McGill University

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