Abstract
Instrumentation is described for simultaneous measurement of feeding duration (time actually spent feeding during a nominal meal) and weight of food eaten in individual meals throughout 24-hr periods in free-feeding rats. These variables were measured in two rat strains. Meal weight cannot usefully be estimated directly from meal duration (total time from beginning to end of a nominal meal) or from meal feeding duration. An adjustment procedure is described that removes systematic error and allows a useful estimate to be made from meal feeding duration. The discrepancy remaining between measured and estimated meal size is quite large and is a measure of the independence of control of food intake and control of the behavioral output of feeding.
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