Abstract
Four pigtail monkeys ( Macaca nemestrina) with lesions of the dorsolateral prefrontal cortex made fewer transposition of brightness responses and more errors on a concurrently presented brightness discrimination than six unoperated controls. The same lesioned and unoperated monkeys exhibited markedly different equivalence responses of form, size, and orientation. The differences in equivalence responses were interpreted to mean that frontal ablations disrupt or slow the information extraction process by which objects and events are organized into a stable representation of the environment.
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