title: DISPLACEMENT AND DURATIONAL CHARACTERISTICS OF LEVER PRESSING UNDER A VARIABLE RATIO SCHEDULE AND SUBSEQUENT EXTINCTION. NADC-ML-64 09.
mesh_terms: D003078:Colchicine / Q000031:analogs & derivatives; D005108:Extinction, Psychological; D007858:Learning; D051381:Rats; D012054:Reinforcement, Psychology; D012106:Research
chemical_list: C069178:N-acetoacetyl-N-deacetylcolchicine; D003078:Colchicine
keywords: EXPERIMENTAL LAB STUDY; EXTINCTION (PSYCHOLOGY); LEARNING; RATS; REINFORCEMENT (PSYCHOLOGY)