Abstract
Seven rats were employed to study the periodicity of food intake as measured by a simple bar press response. After 14 days of habituation to a CRF schedule in a 12-hr dark, 12-hr light environment, animals' responses were recorded during four subsequent days. Mean number of meals, bar presses/meal, and total number of bar presses were greater during the dark period, whereas intervals between successive meals were significantly shorter than those during comparable light periods. No differences were found between the ratio of meal length to bar presses or the rate of responding per meal during the dark and the light periods. Results were compared with recent reports of feeding patterns in rats allowed free access to food.
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