海洛因成瘾者冲动行为的事件相关电位P300研究

摘要

目的 探讨海洛因成瘾者冲动行为的事件相关电位(ERP)P300的特点.方法 运用神经心理学试验范式,海洛因成瘾组和健康对照组在执行爱荷华赌博任务(IGT)时同步进行ERP脑电描记,数据采集后分析比较2组被试P300的波幅和潜伏期,并与冲动性量表(BIS-11)的测评结果作相关分析.结果 海洛因成瘾组BIS评分、选择“高频损失”纸牌次数[(75.12±12.49)分；(91.14 ±21.35)次]高于正常对照组[(66.54±8.61)分；(73.71 ±18.91)次],均差异有统计学意义(P＜0.05)；2组被试在执行IGT时均出现明显的P300的波形,其中海洛因成瘾组P300的波幅、潜伏期[(4.92±1.14) μV；(293.43±36.21)ms]低于对照组[(7.65±1.59) μV；(332.68 ±40.15)ms],且与BIS评分呈负相关(r=-0.76,-0.52),差异及相关性有统计学意义(P＜0.05),而进一步Logistic回归分析显示,BIS评分仅与P300波幅相关(P＜0.05).结论 海洛因成瘾者冲动行为P300的异常可反映成瘾者的冲动行为,海洛因成瘾者的较高冲动性行为可能是成瘾及复吸的原因之一.%Objective To investigate the characteristic of P30o event-related potentials(ERP) of impulsive behavior in heroin addicts.Methods The Iowa gambling task (IGT) were performed by using the paradigm for psychological experiment both in heroin addiction group (HA group) and health control group (HC group),the inspection of electroencephalography were underwent in all the subjects concurrently.Following the collection of data of ERP,amplitude and latency of P300 were compared between the two groups,and then the relationship betweenamplitude or latency of P300 and the results of Barratt impulsiveness scale were analyzed separately.Results Compared to HC group,BIS score as well as the numbers of high frequency loss cards were significantly higher in HA group ( HA:75.12 ± 12.49,91.14 ± 21.35 ; HC:66.54 ± 8.61,73.71 ± 18.91 ; P ＜ 0.05 ),while the both two groups had visible waveforms of P30o,and the amplitude and latency were markedly lower ( HA:4.92 ± 1.14,293.43 ± 36.21 ; HC:7.65 ± 1.59,332.68 ± 40.15 ; P ＜ 0.05 ) and were negatively associated with BIS score in HA group( r =-0.76,-0.52,P＜ 0.05).Logistic regression results showed that the scores of BIS-11 were related to amplitude of P30o merely( P ＜ 0.05 ).Conclusion Impulsive behavior can be observed from the abnormal characteristic of the P300 event-related potential of impulsive behavior in heroin addicts,which may partly contribute to both addiction and relapse of heroin addict.