Four groups of 10 rats each were fed ad lib. or in a manner to maintain them 10, 20, or 30% below their free-feeding body weight. Each animal was closely clipped and exposed to the cold (2°C) with radiant heat reinforcement available. Results show that the frequency of radiant heat reinforcement did not vary as a function of deprivation level; however, as the intensity of the radiant heat reinforcement was decreased, the frequency of radiant heat reinforcements increased.
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