Abstract
Aggresive, defensive and fearful behaviour was elicited in ring doves by electrical stimulation of the forebrain, hypothalamus and midbrain. Stimulation in the forebrain producted very variable results: responses elicited from the midbrain were very stereotyped. Strong stimulation in the hypothalamus produced prolonged changes in the electrical thresholds for behaviour. The thresholds were raised after aggressive or defensive responses and lowered after fear. Similar changes could be induced by natural stimulation, and there was an interaction between the after effects of natural and electrical stimulation. The magnitude of the after effects declined with repeated stimulation.
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