Abstract
This paper concerns the use of similarities based on geometric distance in models of categorization. Two problematic implications of such similarities are outlined. First, in a comparison between two stimuli, geometric distance implies that matching features are not taken into account. Second, missing features are assumed not to exist. Only nonmatching features enter into calculations of similarity. A new model is constructed that is based on the ALCOVE model (Kruschke, 1992), but it uses a featurematching similarity measure (see, e.g., Tversky, 1977) rather than a geometric one. It is an on-line model in the sense that both dimensions and exemplars are constructed during the categorization process. The model accounts better than ALCOVE does for data with missing features (Experiments 1 and 2) and at least as well as ALCOVE for a data set without missing features (Nosofsky, Kruschke, & McKinley, 1992). This suggests that, at least for some stimulus materials, similarity in categorization is more akin to a feature-matching procedure than to geometric distance calculation.
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Part of this work was performed while T.V. was a postdoctoral researcher from the Fund for Scientific Research (Flanders) at the University of Leuven. E.A. is a research assistant of the Fund for Scientific Research. The contribution of G.S. was partly supported by Grants G.0266.02 from the Fund for Scientific Research and by Grants OT/01/15 and ZKB1578 from the Research Council of the University of Leuven.
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Verguts, T., Ameel, E. & Storms, G. Measures of similarity in models of categorization. Memory & Cognition 32, 379–389 (2004). https://doi.org/10.3758/BF03195832
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DOI: https://doi.org/10.3758/BF03195832