title: Asymmetrical effect of unilateral cortical lesions and amphetamine on DRL-20: a time-loss analysis.
abstract: Male Sprague Dawley rats received unilateral 1.5 mm diameter focal suction lesions of either the left or right orbito-frontal cortex and were tested for response to 6 doses of amphetamine sulfate ranging from 0.5 to 1.5 mg/kg on a DRL-20 schedule of reinforcement. Right hemispheric lesion animals obtained a greater number of control reinforcements and were more sensitive to amphetamine's disruptive effects, showing a greater dose-related decrease in water rewards obtained than left lesion animals. An analysis method is introduced which combines the interactive effects of premature responses and their IRT value in a way that relates directly to reinforcement attainment. Calculated total session time made unavailable for reinforcement due to premature responding, correlated negatively (r = -.942) with the number of reinforcements obtained.
mesh_terms: D000661:Amphetamine / Q000494:pharmacology*; D000818:Animals; D002540:Cerebral Cortex / Q000502:physiology*; D003216:Conditioning, Operant / Q000187:drug effects*; D008297:Male; D051381:Rats; D011919:Rats, Inbred Strains; D012018:Reflex / Q000187:drug effects; D012055:Reinforcement Schedule; D013997:Time Factors
chemical_list: D000661:Amphetamine