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Single versus multiple systems of category learning: Reply to Nosofsky
 

Summary: Single versus multiple systems
of category learning: Reply to Nosofsky
and Kruschke (2002)
F. GREGORY ASHBY and SHAWN W. ELL
University of California, Santa Barbara, California
Nosofsky and Kruschke (2002) argued that the single-
system ALCOVE model (Kruschke, 1992) can account for
the dual-task category learning data reported by Waldron
and Ashby (2001). In our reply, we argue that Nosofskyand
Kruschke overstated the ability of ALCOVE to account for
the Waldron and Ashby results. In fact, ALCOVE has diffi-
culty with these data, and we show that the only versionsof
ALCOVE that actually fit the Waldron and Ashby accuracy
data make incorrectpredictions about other previouslyun-
reported features of that experiment. We also show that the
dual-system COVIS model (Ashby, Alfonso-Reese, Turken,
& Waldron, 1998) naturally predicts these results.
Waldron and Ashby (2001) reported the results of an ex-
periment in which participantslearned simple and complex
categorystructures undertypicalsingle-taskconditionsand

  

Source: Ashby, F. Gregory - Department of Psychology, University of California at Santa Barbara

 

Collections: Biology and Medicine; Computer Technologies and Information Sciences