Performance under a Go/No-go task in rats selected for high and low impulsivity with a delay-discounting procedure.
Research with animals and humans suggests that impulsivity is both a determinant and a consequence of drug abuse. In the present study, rats screened for high (HiI) or low (LoI) impulsivity using a delay-discounting task were compared on a Go/No-go procedure for intravenous cocaine (0.4 mg/kg) or saccharin pellets (0.1%). An additional aim was to examine the effects of previous cocaine exposure on impulsive choice. Thus, following Go/No-go testing, HiI and LoI rats were reevaluated on delay discounting. The results indicated that HiI and LoI rats did not differ in Go (reinforced) responses or in the number of reinforcements earned under the cocaine or saccharin conditions. However, LoI rats made significantly more No-go (nonreinforced) responses under the cocaine versus the saccharin condition. After the Go/No-go procedure, cocaine-exposed LoI rats were more impulsive on the delay-discounting task for food, compared to LoI rats that were naive to cocaine; however, HiI rats did not differ on this measure. These results indicate that the effects of cocaine on measures of impulsivity may be determined by a preexisting level of impulsive behavior.
Anker
Justin J
JJ
Department of Psychiatry, University of Minnesota, Minneapolis, Minnesota 55455, USA. anke0022@umn.edu
Zlebnik
Natalie E
NE
Gliddon
Luke A
LA
Carroll
Marilyn E
ME
D000818:Animals; D002755:Choice Behavior / Q000187:drug effects / Q000502:physiology*; D003042:Cocaine / Q000009:adverse effects / Q000494:pharmacology; D019970:Cocaine-Related Disorders / Q000150:complications / Q000209:etiology; D003216:Conditioning, Operant / Q000187:drug effects / Q000502:physiology; D004193:Discrimination Learning / Q000187:drug effects / Q000502:physiology*; D004195:Disease Models, Animal; D018765:Dopamine Uptake Inhibitors / Q000009:adverse effects / Q000494:pharmacology; D005260:Female; D005518:Food Preferences / Q000187:drug effects; D007175:Impulsive Behavior / Q000209:etiology / Q000523:psychology*; D009483:Neuropsychological Tests; D051381:Rats; D017208:Rats, Wistar; D011930:Reaction Time / Q000187:drug effects; D012054:Reinforcement, Psychology; D012439:Saccharin / Q000008:administration & dosage; D012646:Self Administration / Q000379:methods
D018765:Dopamine Uptake Inhibitors; D012439:Saccharin; D003042:Cocaine