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情绪加工过程中皮质-边缘系统自下而上和自上而下机制的分离

Dissociating Bottom-Up and Top-Down Mechanisms in the Cortico-Limbic System during Emotion Processing.

作者信息

Comte Magali, Schön Daniele, Coull Jennifer T, Reynaud Emmanuelle, Khalfa Stéphanie, Belzeaux Raoul, Ibrahim El Chérif, Guedj Eric, Blin Olivier, Weinberger Daniel R, Fakra Eric

机构信息

Institut de Neurosciences de la Timone, UMR 7289, Aix-Marseille Université and CNRS, Marseille, France.

INS, UMR 1106, Aix-Marseille Université and INSERM, Marseille, France.

出版信息

Cereb Cortex. 2016 Jan;26(1):144-55. doi: 10.1093/cercor/bhu185. Epub 2014 Aug 27.

Abstract

The cortico-limbic system is critically involved in emotional responses and resulting adaptive behaviors. Within this circuit, complementary regions are believed to be involved in either the appraisal or the regulation of affective state. However, the respective contribution of these bottom-up and top-down mechanisms during emotion processing remains to be clarified. We used a new functional magnetic resonance imaging (fMRI) paradigm varying 3 parameters: emotional valence, emotional congruency, and allocation of attention, to distinguish the functional variation in activity and connectivity between amygdala, anterior cingulate cortex (ACC), and dorsolateral prefrontal cortex (DLPFC). Bottom-up appraisal of negative compared with positive stimuli led to a greater amygdala response and stronger functional interaction between amygdala and both dorsal ACC and DLPFC. Top-down resolution of emotional conflict was associated with increased activity within ACC and higher functional connectivity between this structure, and both the amygdala and DLPFC. Finally, increased top-down attentional control caused greater engagement of the DLPFC, accompanied by increased connectivity between DLPFC and dorsal ACC. This novel task provides an efficient tool for exploring bottom-up and top-down processes underlying emotion and may be particularly helpful for investigating the neurofunctional underpinnings of psychiatric disorders.

摘要

皮质-边缘系统在情绪反应及由此产生的适应性行为中起着关键作用。在这个神经回路中,互补区域被认为分别参与情感状态的评估或调节。然而,在情绪处理过程中,这些自下而上和自上而下机制各自的作用仍有待阐明。我们采用了一种新的功能磁共振成像(fMRI)范式,该范式改变了三个参数:情绪效价、情绪一致性和注意力分配,以区分杏仁核、前扣带回皮质(ACC)和背外侧前额叶皮质(DLPFC)之间活动和连接的功能变化。与积极刺激相比,对消极刺激的自下而上评估导致杏仁核反应更强,以及杏仁核与背侧ACC和DLPFC之间的功能相互作用更强。情绪冲突的自上而下解决与ACC内活动增加以及该结构与杏仁核和DLPFC之间更高的功能连接有关。最后,自上而下注意力控制的增强导致DLPFC的参与度更高,同时DLPFC与背侧ACC之间的连接增加。这项新任务为探索情绪背后的自下而上和自上而下过程提供了一个有效的工具,可能对研究精神疾病的神经功能基础特别有帮助。

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