Temporal dynamics of motor cortex excitability during perception of natural emotional scenes
Temporal dynamics of motor cortex excitability during perception of natural emotional scenes
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DOI：
10.1093/scan/nst139
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发表时间：
2014-10-01
影响因子：
4.2
通讯作者：
Avenanti, Alessio
中科院分区：
文献类型：
--
作者：
Borgomaneri, Sara;Gazzola, Valeria;Avenanti, Alessio
尽管人们普遍认为情绪是身体采取行动的基础，但自然情绪场景的视觉感知对人类运动系统时间动态的影响却很少被研究。在这里，我们使用单脉冲经颅磁刺激（TMS）来评估国际情感图片系统数据库中积极、中性和消极图片的观察和分类过程中的运动兴奋性。在图片出现后 150 和 300 毫秒时，从手部肌肉记录左运动皮层 TMS 的运动诱发电位 (MEP)。在早期时间条件下，我们发现手部运动兴奋性增加，这是对负面图片的感知所特有的。这种早期的负面偏见是通过人际情感环境中体验厌恶情绪（个人痛苦）的个体差异来预测的。在后来的时间条件下，我们发现正面和负面图片的 MEP 都类似地增加，这表明对唤起情绪的场景的反应性增加。通过强调感知情感图片期间运动兴奋性的时间过程，我们的研究为进化观念提供了直接的神经生理学支持，即情绪感知与行动系统密切相关，并且情绪负面事件需要更紧急地调动运动反应。
Although it is widely assumed that emotions prime the body for action, the effects of visual perception of natural emotional scenes on the temporal dynamics of the human motor system have scarcely been investigated. Here, we used single-pulse transcranial magnetic stimulation (TMS) to assess motor excitability during observation and categorization of positive, neutral and negative pictures from the International Affective Picture System database. Motor-evoked potentials (MEPs) from TMS of the left motor cortex were recorded from hand muscles, at 150 and 300 ms after picture onset. In the early temporal condition we found an increase in hand motor excitability that was specific for the perception of negative pictures. This early negative bias was predicted by interindividual differences in the disposition to experience aversive feelings (personal distress) in interpersonal emotional contexts. In the later temporal condition, we found that MEPs were similarly increased for both positive and negative pictures, suggesting an increased reactivity to emotionally arousing scenes. By highlighting the temporal course of motor excitability during perception of emotional pictures, our study provides direct neurophysiological support for the evolutionary notions that emotion perception is closely linked to action systems and that emotionally negative events require motor reactions to be more urgently mobilized.