Abstract
Effects of ventromedial hypothalamic (VMH) lesions were studied in a migratory bird. A single lesion resulted in various combinations of physiological and behavioral responses, the most frequent being marked body weight gain, polydipsia and a failure to display gonadal development, prenuptial molt and Zugunruhe (nocturnal migratory restlessness). This variability in response implies that neural control mechanisms for each effect may be anatomically separable. Specific studies showed that water intake in one population was ten times control levels and was persistently greater for ten months. Locomotor activity was monitored before and after hypothalamic lesions. Ventromedial hypothalamic lesions selectively eliminated Zugunruhe. Termination of nocturnal activity was immediate, occurring the night following surgery.
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