Title: The concavity effect is a compound of local and global effects
Authors: Vandekerckhove, Joachim ×
Panis, Sven
Wagemans, Johan #
Issue Date: 2007
Publisher: Psychonomic Society
Series Title: Perception & Psychophysics vol:69 issue:7 pages:1253-1260
Abstract: Using a change detection paradigm, Barenholtz, Cohen, Feldman, and Singh (2003 Cognition 89 1-9) 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 magnitude of the change (Experiment 1). Furthermore, we find that the effect cannot be attributed to either local or global processing effects, but rather to a combination of both “mere” concaveness and an effect due to changes in the perceived part structure of the stimulus object (Experiment 3). For our data analysis, we used a nonparametric bootstrap method, which greatly increases sensitivity (compared to more traditional analyses like ANOVA).
ISSN: 0031-5117
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Laboratory for Experimental Psychology
Department of Managerial Economics, Strategy and Innovation (MSI), Leuven
Quantitative Psychology and Individual Differences
Specific Teacher Training Programme, Faculty of Arts, Leuven
× corresponding author
# (joint) last author

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