Discusses the proposition that the use of prototypes and criterial attributes are involved in the conceptual activities of the right and left hemispheres respectively. First, the paper considers the general theory concerning right and left hemispheric functions. A brief review of prototypic and criterial attribute modes of concept formation are presented next. Then experimental data on the relative skills of the hemispheres is presented. Finally, the evidence for assigning certain conceptual processes to each hemisphere is examined.
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