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Copyright 2003 Psychonomic Society, Inc. 1114 Memory & Cognition

Summary: Copyright 2003 Psychonomic Society, Inc. 1114
Memory & Cognition
2003, 31 (7), 1114-1125
Categorizationis a criticalskill thatevery organismmust
possess in at least a rudimentary form, because it allows
organisms to respond differently, for example, to nutrients
and poisons and to predators and prey. There is much re-
cent evidence that human category learning relies on mul-
tiplesystems (e.g., Ashby, Alfonso-Reese, Turken, & Wal-
dron, 1998; Ashby & Ell, 2001,2002a, 2002b;Erickson &
Kruschke, 1998; Pickering, 1997; Smith, Jonides, &
Koeppe, 1996;Smith, Patalano,& Jonides, 1998; Waldron
& Ashby, 2001). In all cases in which multiple systems
have been proposed, it has been hypothesizedthat one sys-
tem uses explicit (i.e., rule-based) reasoning and at least
one other system involves some form of implicit learning.
Nevertheless, there is still much disagreement. First, the
proposal that there are multiple category-learningsystems
is disputed.In particular,Nosofsky and his colleagueshave
argued that single-system models can account for many of


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


Collections: Biology and Medicine; Computer Technologies and Information Sciences