Abstract
A model is presented which identifies the amygdala and hippocampus with two distinct attention-directing processes. The process to which the amygdala contributes is postulated to heighten awareness of experiences as a function of previous reinforcement, while the process to which the hippocampus contributes acts to diminish awareness of experience as a function of the probability of non-reinforcement. The manner in which these processes govern problem-solving behavior is outlined, and a number of hypotheses generated. These hypotheses were tested using monkeys with hippocampal and amygdaloid lesions. The results of these experiments were generally in agreement with the model, and the two lesion groups were found to be as distinct from each other as either group was from sham-operated controls.
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