Effects of Similarity and Practice on Speeded Classification Response Times and Accuracies: Further Tests of an Exemplar-retrieval Model

Overview

Journal Mem Cognit

Specialty Psychology

Date 1999 Mar 24

PMID 10087858

Citations 11

Authors

R M Nosofsky

Affiliations

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Abstract

Observers were tested in a perceptual category-learning experiment in which they were instructed to make classification decisions as rapidly as possible without making errors. Nosofsky and Palmeri's (1997b) exemplar-based random walk (EBRW) model of speeded classification was tested for its ability to fit the classification response times and accuracies. The authors demonstrated that the EBRW model provided good quantitative fits to the mean response times and accuracies associated with individual objects as a function of their locations in a multidimensional similarity space and as a function of practice in the task. Preliminary evidence was also obtained that stimulus-specific adjustments in the random walk response criteria may have occurred during the course of learning.

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