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Summary: Interactions between declarative and procedural-learning categorization systems
F. Gregory Ashby *, Matthew J. Crossley
University of California, Santa Barbara, United States
a r t i c l e i n f o
Article history:
Received 5 October 2009
Revised 2 March 2010
Accepted 15 March 2010
Available online 19 March 2010
Keywords:
Memory systems
Categorization
a b s t r a c t
Two experiments tested whether declarative and procedural memory systems operate independently or
inhibit each other during perceptual categorization. Both experiments used a hybrid category-learning
task in which perfect accuracy could be achieved if a declarative strategy is used on some trials and a pro-
cedural strategy is used on others. In the two experiments, only 2 of 53 participants learned a strategy of
this type. In Experiment 1, most participants appeared to use simple explicit rules, even though control
participants reliably learned the procedural component of the hybrid task. In Experiment 2, participants
pre-trained either with the declarative or procedural component and then transferred to the hybrid
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