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The role of the amygdala in processing social and affective touch
Current Opinion in Behavioral Sciences ( IF 5 ) Pub Date : 2021-09-01 , DOI: 10.1016/j.cobeha.2021.08.004
Katalin M Gothard 1 , Andrew J Fuglevand 1
Affiliation  

The amygdala plays a central role in emotion and social behavior, yet its role in processing social and affective touch is not well established. Longitudinal studies reveal that touch-deprived infants show later in life exaggerated emotional reactivity related to structural and functional changes in the amygdala and other brain structures. The internal organization and connectivity of the amygdala is well-suited to process the sensory features of tactile stimuli and also the socio-cognitive dimensions of the received touch. The convergent processing of bottom-up and top-down pathways that carry information about touch results in the elaboration of context appropriate autonomic responses. Indeed, the positive value of affective touch in humans and social grooming in non-human primates is correlated with vagal tone and the release of oxytocin and endogenous opioids. Grooming, the non-human primate equivalent of affective touch in humans, reduces vigilance, that depends on the amygdala. During touch-induced vagal tone and low vigilance, neural activity in the amygdala is substantially different from activity corresponding to the attentive processing of tactile stimuli. Under these circumstances neurons no longer respond phasically to each touch stimulus, rather they signal a sustained functional state in which the amygdala appears decoupled from monitoring the external environment.



中文翻译:

杏仁核在处理社交和情感触摸中的作用

杏仁核在情感和社会行为中发挥着核心作用,但其在处理社会和情感接触方面的作用尚不明确。纵向研究表明,触摸被剥夺的婴儿在以后的生活中会表现出与杏仁核和其他大脑结构的结构和功能变化相关的夸大的情绪反应。杏仁核的内部组织和连接非常适合处理触觉刺激的感官特征以及所接收触摸的社会认知维度。携带有关触摸信息的自下而上和自上而下路径的聚合处理导致了上下文适当的自主反应的详细说明。事实上,人类情感触摸和非人类灵长类动物社交梳理的积极价值与迷走神经张力以及催产素和内源性阿片类药物的释放相关。在非人类灵长类动物中,梳理毛发相当于人类的情感触摸,会降低警惕性,这取决于杏仁核。在触摸引起的迷走神经张力和低警惕性期间,杏仁核中的神经活动与对应于触觉刺激的注意力处理的活动有很大不同。在这种情况下,神经元不再对每个触摸刺激做出阶段性反应,而是发出持续的功能状态信号,在这种状态下,杏仁核似乎与监视外部环境脱钩。

更新日期:2021-09-02
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