Social Entrainment of the Feeding Behavior in Monkeys

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Abstract
Two monkeys were placed where they could see and hear each other and were rewarded with a 0.15 g food pellet every time they pressed a lever 35 times. For the next 30 days one of the animals was rewarded with a 0.30 g pellet for the same task, while the reward for the Monkeys other subject remained unchanged at 0.15 g. As a result, the animal with the smaller reward reduced his food intake significantly, thus providing evidence of social entrainment of the feeding behavior. A similar conclusion was drawn when during the next 30-day period, the reward for both animals was 0.30 g.

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