title: THE EFFECT OF MULTIPLE S-DELTA PERIODS ON RESPONDING ON A FIXED-INTERVAL SCHEDULE. II. IN A PRIMATE.
mesh_terms: D000818:Animals; D010856:Columbidae; D005502:Food; D000882:Haplorhini; D007858:Learning; D012054:Reinforcement, Psychology; D012106:Research
keywords: EXPERIMENTAL LAB STUDY; LEARNING; MONKEYS; REINFORCEMENT (PSYCHOLOGY)