The present study sought to distinguish the independent contributions of the amygdala and hippocampus to fear expression.
Rhesus monkeys (Macaca mulatta) with bilateral excitotoxic amygdala lesions (n=4), bilateral excitotoxic hippocampal lesions (n=8), and non-operated controls (n=9) reach for junk-neutral objects or fear is ready. Trigger a stimulus (rubber snake or jumping rubber spider) for a food reward. The monkey was exposed to each stimulus for 30 seconds. On each trial, the monkey's latency to receive the food reward was recorded and the monkey's systemic response to the object was assessed. Confirming previous studies, both manipulated groups exhibited shorter latencies to feed and less defensive and approaching behavior when exposed to anxiety-inducing stimuli compared with controls. understood. However, only monkeys with amygdala lesions showed abnormal and exaggerated visual interest in snakes and spiders. In contrast, monkeys with hippocampal lesions exhibited behaviors unrelated to the presence of fear stimuli, indicating a lack of interest and emotional response to snakes and spiders.
These data indicate that the hippocampus and amygdala independently contribute to the global expression of defensive responses.
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