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Psychonomic Bulletin & Review 1999, 6 (3), 363-378

Summary: Psychonomic Bulletin & Review
1999, 6 (3), 363-378
There is much recent evidence that human category
learning relies on multiple systems (e.g., Ashby, Alfonso-
Reese, Turken, & Waldron, 1998; Erickson & Kruschke,
1998; Smith, Patalano, & Jonides, 1998; Smith, Patalano,
Jonides, & Koeppe, 1996). The consensus is that one sys-
tem is rule or theory based and one involves some form
of implicit learning. There is little agreement, however,
about the nature of the implicit learning system. One pos-
sibility is that the implicit system computes some form of
decision function. In most cases, this is equivalent to
constructing a decision boundary that separates the con-
trasting categories (Ashby, 1992a; Ashby & Lee, 1991,
1992; Ashby & Maddox, 1990, 1992, 1993; Maddox &
Ashby, 1993). A second possibility, however, is that the
implicit system compares the stimulus with the memory
traces of past category exemplars (see, e.g., Brooks,
1978; Estes, 1986; Medin & Schaffer, 1978; Nosofsky,
1986) or simply learns to associate responses (or response


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


Collections: Biology and Medicine; Computer Technologies and Information Sciences