An enkephalinergic mechanism involved in amygdaloid suppression of affective defence behavior elicited from the midbrain periaqueductal gray in the cat

A series of recent studies in our laboratory have provided evidence that opioid peptides powerfully suppress feline affective defense behavior at the level of the midbrain periaqueductal gray (PAG). In the present study, we tested the hypothesis that the central (CE) nucleus of the amygdala constitu...

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