Feedback can be superior to observational training for both rule-based and information-integration category structures.
The effects of two different types of training on rule-based and information-integration category learning were investigated in two experiments. In observational training, a category label is presented, followed by an example of that category and the participant's response. In feedback training, the stimulus is presented, and the participant assigns it to a category and then receives feedback about the accuracy of that decision. Ashby, Maddox, and Bohil (2002. Observational versus feedback training in rule-based and information-integration category learning. Memory & Cognition, 30, 666-677) reported that feedback training was superior to observational training when learning information-integration category structures, but that training type had little effect on the acquisition of rule-based category structures. These results were argued to support the COVIS (competition between verbal and implicit systems) dual-process account of category learning. However, a number of nonessential differences between their rule-based and information-integration conditions complicate interpretation of these findings. Experiment 1 controlled between-category structures for participant error rates, category separation, and the number of stimulus dimensions relevant to the categorization. Under these more controlled conditions, rule-based and information-integration category structures both benefited from feedback training to a similar degree. Experiment 2 maintained this difference in training type when learning a rule-based category that had otherwise been matched, in terms of category overlap and overall performance, with the rule-based categories used in Ashby et al. These results indicate that differences in dimensionality between the category structures in Ashby et al. is a more likely explanation for the interaction between training type and category structure than the dual-system explanation that they offered.
a School of Psychology , University of Plymouth , Plymouth , UK.
C E R
CE
Edmunds
Fraser
F
Milton
Andy J
AJ
Wills
D000704:Analysis of Variance; D003210:Concept Formation / Q000502:physiology*; D005246:Feedback; D005260:Female; D006801:Humans; D007858:Learning / Q000502:physiology*; D008297:Male; D008960:Models, Psychological; D019370:Observation
COVIS; Categorization; Competition between verbal and implicit systems; Explicit; Feedback; Implicit