Title: Idealness and similarity in goal-derived categories: A computational examination
Authors: Voorspoels, Wouter ×
Storms, Gerrit
Vanpaemel, Wolf #
Issue Date: Feb-2013
Series Title: Memory & Cognition vol:41 issue:2 pages:312-327
Abstract: The finding that the typicality gradient in goal-derived categories is mainly driven by ideals rather than by exemplar similarity has stood uncontested for nearly three decades. Due to the rather rigid earlier implementations of similarity, a key question has remained-that is, whether a more flexible approach to similarity would alter the conclusions. In the present study, we evaluated whether a similarity-based approach that allows for dimensional weighting could account for findings in goal-derived categories. To this end, we compared a computational model of exemplar similarity (the generalized context model; Nosofsky, Journal of Experimental Psychology. General 115:39-57, 1986) and a computational model of ideal representation (the ideal-dimension model; Voorspoels, Vanpaemel, & Storms, Psychonomic Bulletin & Review 18:1006-114, 2011) in their accounts of exemplar typicality in ten goal-derived categories. In terms of both goodness-of-fit and generalizability, we found strong evidence for an ideal approach in nearly all categories. We conclude that focusing on a limited set of features is necessary but not sufficient to account for the observed typicality gradient. A second aspect of ideal representations-that is, that extreme rather than common, central-tendency values drive typicality-seems to be crucial.
ISSN: 0090-502X
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Quantitative Psychology and Individual Differences
Laboratory for Experimental Psychology
× corresponding author
# (joint) last author

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