反馈相关负波与成瘾

Feedback-related negativity and addiction

反馈相关负波(feedback-related negativity, FRN)是反馈加工诱发的脑电成分,体现了个体对奖赏的敏感性。成瘾分为物质成瘾和行为成瘾,两类个体的反馈加工都呈现病理性模式。相对于普通反馈物(如金钱),物质成瘾个体在加工成瘾物质时诱发的FRN波幅显著增大;在与非成瘾被试的对照研究中,物质成瘾者加工金钱反馈时的FRN也表现出与成瘾相关的异常模式;在行为成瘾个体中亦观察到与物质成瘾个体类似的FRN失调现象。但以往多数研究中对成瘾类型的区分还不够详细,未来研究应进一步考虑成瘾不同亚型的特点;且成瘾个体往往伴随其他精神障碍(如抑郁、焦虑),将来的研究要区分共病因素的影响,揭示成瘾独特的奖赏加工机制问题。

Feedback-related negativity(FRN) refers to the electroencephalogram component induced by feedback processing which reflects the individual ’s sensitivity to reward. Addiction can be broadly classified into substance addiction and behavior addiction. Both types of addicted individuals show pathological patterns in feedback processing. Comparing with the ordinary feedback(such as money), the F RN amplitude induced by feedback of addiction substance significantly increased in individuals with substance addiction. In the control study with non-addicted subjects, substance addicts also showed abnormal patterns relating to addiction when processing monetary feedback stimuli. Similar FRN irregularities were also observed in individuals with behavioral addiction. However, the classification of addiction disorders in most previous studies is not specific enough, and the characteristics of different subt ypes of addiction disorders should be further taken into consideration in future studies. Moreover, addicted individuals are often accompanied by other mental disorders(such as depression, anxiety). Further studies should distinguish the influences of comorbid factors and reveal the unique reward processing mechanisms underlying addiction.