Neurophysiological evidence of motor contribution to vicarious affective touch.

IF 2.9 2区 医学 Q2 NEUROSCIENCES
Niccolò Butti, Cosimo Urgesi, Stergios Makris, Francis P McGlone, Rosario Montirosso, Valentina Cazzato
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Abstract

Understanding observed interpersonal touch, particularly the so-called affective touch targeting the CT fibers, is essential for social interactions. Research has documented that observing other people being touched activates the same cortical areas involved in direct tactile experiences. However, observing interpersonal touch also activates an inner simulation of the movements in the observer's motor system. Given the social and affective significance of CT-optimal touch, the present study tested the hypothesis that observing stroking touches targeting or not targeting the CT fibers system might distinctly influence motor resonance to vicarious touch. With this aim, we used single-pulse transcranial magnetic stimulation and motor-evoked potentials recording while participants observed video clips of interpersonal touch events at different stroking velocities. We found a modulation of motor system activity, particularly a decrease in corticospinal excitability, when observing CT-optimal touch as opposed to non-CT-optimal velocities, a mechanism that might aid in understanding the touchee's feelings during vicarious interpersonal touch. Moreover, participants with higher reliance on bodily cues to be emotionally aware showed greater motor suppression for CT-optimal compared to non-CT-optimal velocities. These results shed light on the complex interplay between motor and somatosensory systems in social touch perception and emphasize the importance of affective touch in human social interactions.

神经生理学证据表明,运动有助于产生代入式情感触觉。
了解观察到的人际触觉,尤其是以 CT 纤维为目标的所谓情感触觉,对于社会交往至关重要。研究表明,观察他人被触摸会激活与直接触觉体验相关的皮层区域。然而,观察人与人之间的触摸也会激活观察者运动系统对动作的内在模拟。鉴于 CT 最佳触觉的社会和情感意义,本研究测试了这样一个假设:观察以 CT 纤维系统为目标或不以 CT 纤维系统为目标的抚摸可能会明显影响对替代性触觉的运动共振。为此,我们使用了单脉冲经颅磁刺激和运动诱发电位记录,同时让参与者观察不同抚摸速度下的人际抚摸事件视频剪辑。我们发现,在观察 CT 最佳抚摸速度与非 CT 最佳抚摸速度时,运动系统的活动会受到调节,尤其是皮质脊髓兴奋性会降低,这种机制可能有助于理解被抚摸者在替代性人际抚摸过程中的感受。此外,与非 CT 最佳速度相比,更依赖身体线索来感知情感的参与者对 CT 最佳速度表现出更大的运动抑制。这些结果揭示了运动系统和体感系统在社交触觉感知中复杂的相互作用,并强调了情感触觉在人类社交互动中的重要性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Cerebral cortex
Cerebral cortex 医学-神经科学
CiteScore
6.30
自引率
8.10%
发文量
510
审稿时长
2 months
期刊介绍: Cerebral Cortex publishes papers on the development, organization, plasticity, and function of the cerebral cortex, including the hippocampus. Studies with clear relevance to the cerebral cortex, such as the thalamocortical relationship or cortico-subcortical interactions, are also included. The journal is multidisciplinary and covers the large variety of modern neurobiological and neuropsychological techniques, including anatomy, biochemistry, molecular neurobiology, electrophysiology, behavior, artificial intelligence, and theoretical modeling. In addition to research articles, special features such as brief reviews, book reviews, and commentaries are included.
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