Varied effects of conventional antiepileptics on responding maintained by negative versus positive reinforcement.
We analyzed the effects of four conventional antiepileptic drugs (AEDs) - carbamazepine (CBZ), ethosuximide (ETH), phenytoin (PHT), and valproate (VPA) - on operant behavior maintained by negative or positive reinforcement contingencies. Rats were trained to lever press on a free-operant avoidance schedule or variable-interval (VI) schedule of appetitive reinforcement. Dose-effect functions were separately established on each reinforcement contingency for CBZ (12.5-100 mg/kg), ETH (25-200 mg/kg), PHT (12.5-50 mg/kg), and VPA (50-400 mg/kg). CBZ and PHT reduced responding on free-operant avoidance and VI appetitive reinforcement tasks, with positively reinforced behavior reduced at lower drug dosages than negatively reinforced responding. ETH and VPA reduced responding on the VI appetitive reinforcement task, but did not alter behavior maintained on the free-operant avoidance schedule. Our results suggest that conventional AEDs vary in their effect on operant behavior, depending on the type of reinforcement process maintaining responding.
John F. Kennedy Center on Human Development, Vanderbilt University, Nashville, TN, USA.
Celeste
C
Roberts
Mark T
MT
Harvey
Michael E
ME
May
Maria G
MG
Valdovinos
Tina G
TG
Patterson
Maria H
MH
Couppis
Craig H
CH
Kennedy
D000704:Analysis of Variance; D000818:Animals; D000927:Anticonvulsants / Q000494:pharmacology*; D001522:Behavior, Animal / Q000187:drug effects; D003216:Conditioning, Operant / Q000187:drug effects*; D004305:Dose-Response Relationship, Drug; D008297:Male; D051381:Rats; D017207:Rats, Sprague-Dawley; D012054:Reinforcement, Psychology
D000927:Anticonvulsants