Many studies have used food-motivated maze running to assess the effects of electroconvulsive shock (ECS) on learning and retention. These studies have generally assumed that an impaired maze performance results only from the effects of the shocks on the cerebral functions subserving learning and retention. However, if hunger drive is decreased as a result of shock, an impairment in performance may occur independently of the cerebral effects. That hunger drive may indeed be affected is suggested in the studies of Bernberg (1) and Jensen and Stainbrook (6), who report alterations in the eating behavior of the rat following a series of ECS's. Neither of these studies, however, was designed specifically for the purpose of investigating the effect of ECS on hunger drive.The study reported here did so, two chief considerations determining the experimental plan. First, since Miller, Bailey, and Stevenson (8) had demonstrated that in rats with lesions in the hypothalamus increased food intake is associated with decreased hunger drive, and since Hoyt and Rosvold (5) had implicated the hypothalamus in the effects of ECS, it was necessary to measure separately the effects of ECS on food intake and hunger drive. Second, ECS in the rat results in decreased activity which may affect eating in two ways: an inactive animal requires less food; the activity of consuming food may be subject to the same reduction as is spontaneous locomotion. Therefore, activity measures were made coincident with the measures of eating behavior.
METHOD
AnimalsTwenty-two 160-day-old male albino rats of the Sprague-Dawley strain were housed individually either in separate cages or in activity wheels. They were weighed and then fed at the same time each morning