人类短期延迟消退的情境特异性:虚拟环境中恐惧增强惊吓反应的恢复。

Contextual-specificity of short-delay extinction in humans: renewal of fear-potentiated startle in a virtual environment.

作者信息

Alvarez Ruben P, Johnson Linda, Grillon Christian

机构信息

Mood & Anxiety Disorders Program, National Institute of Mental Health, NIH, Bethesda, Maryland 20892, USA.

出版信息

Learn Mem. 2007 Apr 5;14(4):247-53. doi: 10.1101/lm.493707. Print 2007 Apr.

Abstract

A recent fear-potentiated startle study in rodents suggested that extinction was not context dependent when extinction was conducted after a short delay following acquisition, suggesting that extinction can lead to erasure of fear learning in some circumstances. The main objective of this study was to attempt to replicate these findings in humans by examining the context specificity of short-delay extinction in an ABA renewal procedure using virtual reality environments. A second objective was to examine whether renewal, if any, would be influenced by context conditioning. Subjects underwent differential aversive conditioning in virtual context A, which was immediately followed by extinction in virtual context B. Extinction was followed by tests of renewal in context A and B, with the order counterbalanced across subjects. Results showed that extinction was context dependent. Evidence for renewal was established using fear-potentiated startle as well as skin conductance and fear ratings. In addition, although contextual anxiety was greater in the acquisition context than in the extinction context during renewal, as assessed with startle, context conditioning did not influence the renewal effect. These data do not support the view that extinction conducted shortly after acquisition is context independent. Hence, they do not provide evidence that extinction can lead to erasure of a fear memory established via Pavlovian conditioning.

摘要

最近一项针对啮齿动物的恐惧增强惊吓研究表明,在习得后短时间延迟进行消退时,消退并不依赖于情境,这表明在某些情况下消退可以导致恐惧记忆的消除。本研究的主要目的是通过在使用虚拟现实环境的ABA更新程序中检查短延迟消退的情境特异性,试图在人类中复制这些发现。第二个目的是检查如果存在更新,它是否会受到情境条件作用的影响。受试者在虚拟情境A中接受差别厌恶条件作用,随后立即在虚拟情境B中进行消退。消退之后在情境A和B中进行更新测试,测试顺序在受试者之间进行平衡。结果表明消退是依赖于情境的。使用恐惧增强惊吓以及皮肤电传导和恐惧评分确定了更新的证据。此外,尽管在更新期间,如通过惊吓评估的那样,习得情境中的情境焦虑比消退情境中的更大,但情境条件作用并未影响更新效应。这些数据不支持习得后不久进行的消退不依赖于情境这一观点。因此,它们没有提供证据表明消退可以导致消除通过经典条件作用建立的恐惧记忆。

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