PSYCH OpenIR  > 健康与遗传心理学研究室
Alternative TitleThe Craving for Drugs of Methamphetamine Addicts in Different Withdrawal Period ——a research based on the modulation effect of motivation on startle
Thesis Advisor李勇辉
Degree Grantor中国科学院研究生院
Place of Conferral北京
Degree Discipline医学心理学
Keyword甲基苯丙胺 中脑边缘多巴胺系统 动机 惊反射 渴求
本研究以甲基苯丙胺成瘾者为对象,考察戒断期不同时间点其基本情绪刺激引发动机状态及药物相关线索引发的渴求程度。研究结果:(1)对照组的正负性情绪刺激下惊反射调节具有双向性:正性情绪刺激-惊反射减小,负性情绪刺激-惊反射增大,甲基苯丙胺成瘾者负性情绪刺激下惊反射也会增强,但正性情绪刺激的呈现却未能降低甲基苯丙胺成瘾者的惊反射,即使戒断 1年以后,正性情绪刺激仍然不能降低成瘾者的惊反射;(2)药物相关的线索对甲基苯丙胺成瘾者的惊反射具有显著的抑制作用,相比毒品和吸毒场所,吸毒器具和使用过程有关的图片更能抑制甲基苯丙胺成瘾者的惊反射;(3)对于不同戒断期的甲基苯丙胺成瘾者线索相关线索对惊反射的抑制程度不同, 4到 6个月戒断期抑制现象最为明显 ;(4)阈下呈现药物相关线索也能够显著抑制甲基苯丙胺成瘾者的惊反射。
本研究结果表明,甲基苯丙胺成瘾者对自然奖赏欲求降低,随着戒断时间的延长,成瘾者对正性情绪刺激的反应仍不能恢复。药物相关线索能够引发甲基苯丙胺成瘾者对药物的渴求,在戒断期 4 到 6 个月对药物的欲求程度最高,甲基苯丙胺成瘾者对药物相关线索存在无意识自动化的加工。本研究首次运用惊反射作为甲基苯丙胺成瘾者对药物的渴求程度测量的客观工具,展现了戒断期甲基苯丙胺成瘾者的渴求状态的变化规律,对成瘾者的复吸的防治具有重要作用。
Other AbstractMesolimbic dopamine system,  playing a crucial role in reward motivation system, also is a participant in most drug addiction and seeking. The impact of methamphetamine  (MA) on this circuitry may be more profound than other addictive drugs. Long term MA abuse leads to decreasing dopamine levels, receptor down-regulation, neuronal morphology changes and motivation system sensitization. The neural deficit likely contributes to MA addicts having less appetite for natural reward and high rate of relapse.  
Carving is one of major cause of relapse. However, self-report of MA addicts’ craving for MA has low reliability. Heart rate and skin conductance as physiological methods  can not differentiate the status of their motivation (appetite / aversive). Startle reflex (SR) is modulated by motivation status, aversive-potentiated / appetitive-inhibited. Thus, SR can measure the craving induced by drug-related cues.  
MA addicts in different withdrawal periods were tested in this study, including their motivation to basic emotional stimuli and craving to drug-related cues. Research results: (1)In control group, positive and negative emotional stimuli has bidirectional regulation effect on SR: positive stimuli reduced SR and negative stimuli increased SR. MA addicts’ startle enhanced by negative stimuli, but positive stimuli failed to reduce their SR even after one year withdrawal; (2) Drug-related cues inhibited MA addicts’ SR significantly; compared to images of drug and images of drug context, MA addicts’ SR is inhibited much more by images of drug instrument and images of drug using; (3) Different withdrawal periods for MA addicts have different inhibition of SR under drug-related cues, and this phenomenon is the most apparent in 4-6-month withdrawal period MA addicts; (4) Subliminal drug-related stimuli suppress MA addicts’ SR significantly.  
The results of this study show that MA addicts’  appetite for natural reward decreased, and this phenomenon wouldn’t disappear over time. Secondly, drug-related cues can trigger MA addicts’ craving for MA, and MA addicts has the highest degree of craving in 4-6 months’ withdrawal Finally MA addicts have automated processing of drug-related cues. This study firstly used startle reflex as an objective tool to measure MA addicts craving degree, and demonstrated the variation of MA addicts craving in different withdrawal periods. It may prove an effective way of preventing MA addicts’ relapse.
Subject Area药物成瘾的脑机制
Document Type学位论文
Recommended Citation
GB/T 7714
王超逸. 报告题目不同戒断期甲基苯丙胺成瘾者对药物渴求的研究——基于动机状态对惊反射的调节[D]. 北京. 中国科学院研究生院,2015.
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