Circadian Rhythms in The Feeding Behaviour Of Laboratory Monkeys

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Abstract
Summary Two rhesus monkeys were trained on a lever-pressing task (35 lever presses for one pellet of food) and placed into isolation. Water was available ad lib. and the animals could 'work' for food at anytime they chose. Both animals exhibited a single major feeding period which repeated itself approximately every twenty-four hours, and while their individual performance curves were almost identical, their peaks were three hours apart.

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