Abstract
The effects of sensory reinforcement upon the exploration of indifferent stimuli was tested using two groups of rats maintained at 75 % or 100% body weight. Subjects were leverpress-tested on two non contingent bars for 11 days and then were shifted so that depression of one of two levers resulted in light onset; testing continued for 9 more days. Subjects at 100% body weight barpressed for light at a higher rate than subjects at 75% body weight prior to the drive shift. After the drive shift, subjects changed to 100% body weight demonstrated a large increment in responding, while subjects shifted to 75% body weight showed a lesser postshift decrement in responding.
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