Department of Psychotherapy and Systems Neuroscience, Justus Liebig University Giessen, Giessen, Germany.
Bender Institute of Neuroimaging, Justus Liebig University Giessen, Giessen, Germany.
Psychol Med. 2024 Feb;54(3):548-557. doi: 10.1017/S0033291723002179. Epub 2023 Aug 9.
BACKGROUND: There are phenomenological similarities between social anxiety disorder (SAD) and posttraumatic stress disorder, such as a provoking aversive event, posttraumatic stress symptoms (e.g. intrusions) in response to these events and deficient (context-dependent) fear conditioning processes. This study investigated the neural correlates of context-dependent extinction recall and fear renewal in SAD, specifically in patients with intrusions in response to an etiologically relevant aversive social event. METHODS: During functional magnetic resonance imaging a two-day context-dependent fear conditioning paradigm was conducted in 54 patients with SAD and 54 healthy controls (HC). This included fear acquisition (context A) and extinction learning (context B) on one day, and extinction recall (context B) as well as fear renewal (contexts C and A) one day later. The main outcome measures were blood oxygen level-dependent responses in regions of interest and skin conductance responses. RESULTS: Patients with SAD showed reduced differential conditioned amygdala activation during extinction recall in the safe extinction context and during fear renewal in the acquisition context compared to HC. Patients with clinically relevant intrusions moreover exhibited hypoactivation of the ventromedial prefrontal cortex (vmPFC) during extinction learning, extinction recall, and fear renewal in a novel context, while amygdala activation more strongly decreased during extinction learning and increased during fear renewal in the acquisition context compared with patients without intrusions. CONCLUSIONS: Our study provides first evidence that intrusions in SAD are associated with similar deficits in context-dependent regulation of conditioned fear via the vmPFC as previously demonstrated in posttraumatic stress disorder.
背景:社交焦虑障碍(SAD)和创伤后应激障碍之间存在现象学上的相似性,例如引发厌恶事件、对这些事件的创伤后应激症状(例如闯入)以及不足的(上下文相关的)恐惧条件反射过程。本研究调查了 SAD 中上下文相关的消退回忆和恐惧更新的神经相关性,特别是在对与病因相关的厌恶社交事件有侵入性反应的患者中。
方法:在功能磁共振成像中,对 54 名 SAD 患者和 54 名健康对照者(HC)进行了为期两天的上下文相关的恐惧条件反射范式。这包括在一天内进行恐惧获得(上下文 A)和消退学习(上下文 B),以及一天后进行消退回忆(上下文 B)和恐惧更新(上下文 C 和 A)。主要的测量指标是感兴趣区域的血氧水平依赖反应和皮肤电反应。
结果:与 HC 相比,SAD 患者在安全消退情境下的消退回忆和在获得情境下的恐惧更新时,杏仁核的差异条件激活减少。此外,具有临床相关侵入性的患者在新情境下的消退学习、消退回忆和恐惧更新时,腹内侧前额叶皮层(vmPFC)的激活减少,而在获得情境下的消退学习时,杏仁核的激活减少,在恐惧更新时,杏仁核的激活增加,与没有侵入性的患者相比。
结论:我们的研究首次提供了证据,表明 SAD 中的侵入性与创伤后应激障碍中先前证明的通过 vmPFC 进行的条件恐惧的上下文相关调节的类似缺陷有关。
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