title: High impulsivity in rats predicts amphetamine conditioned place preference.
abstract: Stimulants such as d-amphetamine (AMPH) are used commonly to treat attention-deficit hyperactivity disorder (ADHD), but concerns have been raised regarding the use of AMPH due to its reinforcing and potentially addictive properties. The current study examined if individual differences in impulsive choice predict AMPH-induced hyperactivity and conditioned place preference (CPP). Rats were first tested in delay discounting using an adjusting delay procedure to measure impulsive choice and then were subsequently tested for AMPH CPP. High impulsive (HiI) and low impulsive (LoI) rats were conditioned across four sessions with 0.1, 0.5, or 1.5 mg/kg of AMPH. AMPH increased locomotor activity for HiI and LoI rats following 0.5 mg/kg but failed to increase activity following 0.1 and 1.5 mg/kg. CPP was established for HiI rats with both 0.5 and 1.5 mg/kg of AMPH, whereas LoI rats did not develop CPP following any dose of AMPH; HiI and LoI groups differed significantly following 0.5 mg/kg of AMPH. These results indicate that HiI rats are more sensitive to the rewarding effects of AMPH compared to LoI rats, which is consistent with research showing that high impulsive individuals may be more vulnerable to stimulant abuse.
authors.affiliation: Department of Psychology, University of Kentucky, Lexington, KY 40536-0509, USA.
authors.forename: Justin R
authors.initials: JR
authors.lastname: Yates
authors.forename: Julie A
authors.initials: JA
authors.lastname: Marusich
authors.forename: Cassandra D
authors.initials: CD
authors.lastname: Gipson
authors.forename: Joshua S
authors.initials: JS
authors.lastname: Beckmann
authors.forename: Michael T
authors.initials: MT
authors.lastname: Bardo
mesh_terms: D019969:Amphetamine-Related Disorders / Q000453:epidemiology / Q000503:physiopathology*; D000818:Animals; D001289:Attention Deficit Disorder with Hyperactivity / Q000188:drug therapy; D001522:Behavior, Animal / Q000187:drug effects*; D000697:Central Nervous System Stimulants / Q000008:administration & dosage / Q000009:adverse effects*; D003216:Conditioning, Operant; D003913:Dextroamphetamine / Q000008:administration & dosage / Q000009:adverse effects*; D018765:Dopamine Uptake Inhibitors / Q000008:administration & dosage / Q000009:adverse effects; D004305:Dose-Response Relationship, Drug; D004351:Drug Resistance; D004409:Dyskinesia, Drug-Induced / Q000209:etiology*; D007175:Impulsive Behavior / Q000139:chemically induced*; D008297:Male; D009043:Motor Activity / Q000187:drug effects; D051381:Rats; D017207:Rats, Sprague-Dawley; D012201:Reward; D012720:Severity of Illness Index
chemical_list: D000697:Central Nervous System Stimulants; D018765:Dopamine Uptake Inhibitors; D003913:Dextroamphetamine