The concavity effect is a compound of local and global effects From: Perception and Psychophysics | Date: October 1, 2007| Author: Panis, Sven; Wagemans, Johan; Vandekerckhove, Joachim | Copyright Psychonomic Society, Inc. Oct 2007. Provided by ProQuest LLC.Copyright information

Using a change detection paradigm, Barenholtz, Cohen, Feldman, and Singh (2003) found that changes in concave regions of a contour are more easily detected than changes in convex regions. In a series of three experiments, we investigated this concavity effect using the same paradigm. We observed the effect in wire-like stimuli as well as in silhouettes (Experiment 1) and in complex, smoothed images as opposed to angular polygons (Experiment 2). We also observed a systematic effect of the magn...

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