Rats show molar sensitivity to different aspects of random-interval-with-linear-feedback-functions and random-ratio schedules.
Three experiments examined the impact of various aspects of reinforcement contingencies on responding maintained by free-operant schedules by food-deprived rats. Experiment 1 demonstrated that random interval (RI) and random-interval-with-positive-response-reinforcer-feedback (RI+) schedules maintained similar rates of responding at a variety of reinforcer frequencies. Experiment 2 demonstrated that a random ratio (RR) schedule maintained higher rates than RI or RI+ schedules, except at high rates of reinforcement, where response rates were similar on all schedules. Experiment 3 again demonstrated that RR schedules produced higher response rates than either RI or RI+ schedules, but modification of the RI+ schedule to prevent ratio strain enhanced response rates relative to an RI schedule. Together these results reveal a pattern of interacting factors in schedule controlled behavior: at high rates of reinforcement, this factor overrides the impact of other controlling factors, but as reinforcement rate decreases the joint impact of interresponse times reinforcement, response-reinforcer feedback functions, and ratio strain are observed.
Swansea University.
Phil
P
Reed
D000818:Animals; D001522:Behavior, Animal / Q000502:physiology*; D003216:Conditioning, Operant / Q000502:physiology*; D005508:Food Deprivation; D008297:Male; D051381:Rats; D012055:Reinforcement Schedule; D013997:Time Factors