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Implicit visual sensitivity towards slim versus overweight bodies modulates motor resonance in the primary motor cortex: A tDCS study
Cognitive, Affective, & Behavioral Neuroscience ( IF 2.9 ) Pub Date : 2020-12-01 , DOI: 10.3758/s13415-020-00850-0
Stergios Makris 1, 2 , Valentina Cazzato 3
Affiliation  

Motor resonance (MR) can be influenced by individual differences and similarity in the physical appearance between the actor and observer. Recently, we reported that action simulation is modulated by an implicit visual sensitivity towards normal-weight compared with overweight bodies. Furthermore, recent research has suggested the existence of an action observation network responsible for MR, with limited evidence whether the primary motor cortex (M1) is part of this. We expanded our previous findings with regards to the role of an implicit normal-weight-body preference in the MR mechanism. At the same time, we tested the functional relevance of M1 to MR, by using a transcranial direct current stimulation (tDCS) protocol. Seventeen normal-weight and 17 overweight participants were asked to observe normal-weight or overweight actors reaching and grasping a light or heavy cube, and then, at the end of each video-clip to indicate the correct cube weight. Before the task, all participants received 15 min of sham or cathodal tDCS over the left M1. Measures of anti-fat attitudes were also collected. During sham tDCS, all participants were better in simulating the actions performed by normal-weight compared with overweight models. Surprisingly, cathodal tDCS selectively improved the ability in the overweight group to simulate actions performed by the overweight models. This effect was not associated with scores of fat phobic attitudes or implicit anti-fat bias. Our findings are discussed in the context of relevance of M1 to MR and its social modulation by anti-fat attitudes.



中文翻译:

对苗条与超重身体的隐含视觉敏感性调节初级运动皮层的运动共振:tDCS 研究

运动共振 (MR) 可能会受到演员和观察者之间外表的个体差异和相似性的影响。最近,我们报告说,与超重的身体相比,动作模拟受到对正常体重的隐含视觉敏感性的调节。此外,最近的研究表明存在一个负责 MR 的动作观察网络,但初级运动皮层 (M1) 是否是其中的一部分的证据有限。我们扩展了我们先前关于隐含的正常体重体重偏好在 MR 机制中的作用的发现。同时,我们通过使用经颅直流电刺激 (tDCS) 协议测试了 M1 与 MR 的功能相关性。17 名正常体重和 17 名超重参与者被要求观察正常体重或超重演员伸手抓住一个轻或重的立方体,然后在每个视频剪辑的结尾指示正确的立方体重量。在任务之前,所有参与者在左侧 M1 上接受了 15 分钟的假或阴极 tDCS。还收集了反脂肪态度的措施。在假 tDCS 期间,与超重模型相比,所有参与者在模拟正常体重所执行的动作方面都做得更好。令人惊讶的是,阴极 tDCS 选择性地提高了超重组模拟超重模型执行的动作的能力。这种影响与对脂肪的恐惧态度或隐含的反脂肪偏见无关。

更新日期:2020-12-02
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