EFFECT OF FIXED-RATIO THERMAL REINFORCEMENT ON THERMOREGULATORY BEHAVIOR

Rats and squirrel monkeys were tested on fixed-ratio schedules for radiant heat reinforcement in a cold environment. Monkeys worked at a rate determined by the schedule as well as the parameters of thermal reinforcement. Rats failed to demonstrate a behavioral regulation of body temperature on ratio schedules by failing to maintain a rate of work great enough to insure a constant rate of reinforcement per unit time. Body temperature was maintained when continuous reinforcement was available, but decreased on ratios. A low ambient temperature or low body temperature facilitated rate of responding by the rat. Repeated daily tests produced a form of cold acclimatization in rats; behavioral response rate decreased, while the usual decrease in body temperature was attenuated as daily testing progressed. © 1969.