Abstract
An experiment was performed in order to determine the role of the amygdala and surrounding cortex in quiet biting attack elicited from electrical stimulation of the hypothalamus. Stimulation of basal, cortical, and anterior amygdala as well as pyriform cortex and parahippocampal gyrus resulted in a suppression of the attack response and in a constriction of trigeminal sensory fields that are established during hypothalamic stimulation. Stimulation of lateral and central amygdala resulted in a facilitation of the quiet biting attack response and an expansion of the trigeminal sensory fields, and a decreased latency for the occurrence of jaw opening when the sensory field was held constant. These studies suggest that the amygdala modulated quiet biting attack behavior generated by hypothalamic stimulation at least, in part, by virtue of its control over sensory fields.
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