Cognitive sequelae of intravenous amphetamine self-administration in rats:: Evidence for selective effects on attentional performance

被引:73
作者
Dalley, JW
Theobald, DEH
Berry, D
Milstein, JA
Lääne, K
Everitt, BJ
Robbins, TW
机构
[1] Univ Cambridge, Dept Expt Psychol, Cambridge CB2 3EB, England
[2] Guys & St Thomas Hosp, Med Toxicol Unit, London SE1 9RT, England
基金
英国医学研究理事会;
关键词
drug addiction; psychomotor stimulants; 5-choice serial reaction time task; visual attention; executive function; impulsivity;
D O I
10.1038/sj.npp.1300590
中图分类号
Q189 [神经科学];
学科分类号
071006 ;
摘要
Characterizing the nature and severity of cognitive deficits associated with chronic stimulant abuse may provide new insights into the neural substrates of drug addiction because such deficits may contribute to the chronic relapsing nature of compulsive drug use. This investigation examines in rats the long-term cognitive consequences of intravenously self-administered amphetamine, specifically on performance of a 5-choice serial reaction time task (5-CSRTT), which assesses visuo-spatial attention and impulsivity. Rats experienced 5 days of intravenous (i.v.) amphetamine self-administration and were then withdrawn for a period of 9 days, during which time testing on the 5-CSRTT took place. This was repeated on five consecutive occasions for a period of 10 weeks. Controls experienced identical training on the 5-CSRTT but during the self-administration sessions received yoked i.v. infusions of normal saline. The results reveal a selective and reproducible pattern of deficits on the 5-CSRTT following repeated withdrawal from amphetamine self-administration, with deleterious effects on the speed and accuracy of responding as well as increased omission errors. Premature ( impulsive) responding, perseveration, and food consumption latencies were not significantly affected. Deficits in attentional performance fully recovered 4 - 5 days after amphetamine cessation and there was no evidence of any long-term disturbances, even when the attentional load was increased. However, following a 2-month abstinence period, abnormalities in the subsequent effects of acute noncontingent amphetamine were found, with increased omissions, slower response times, and reduced impulsivity. Thus, contingent i.v. amphetamine administration has both short- and long-term consequences, which may be relevant to the complex disturbances that accompany drug addiction.
引用
收藏
页码:525 / 537
页数:13
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