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首页> 外文期刊>The European Journal of Neuroscience >Increases of corticospinal excitability in self-related processing
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Increases of corticospinal excitability in self-related processing

机译：自我加工过程中皮质脊髓兴奋性的增加

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Involvement of fronto-parietal structures within the right hemisphere in bodily self recognition has gained convergent support from behavioural, neuropsychological and neuroimaging studies. Increases in corticospinal excitability via transcranial magnetic stimulation (TMS) also testify to right hemisphere self-related processing. However, evidence for self-dependent modulations of motor excitability is limited to the processing of face-related information that, by definition, conveys someone's identity. Here we tested the hypothesis that vision of one's own hand, as compared with vision of somebody else's hand, would also engage specific self-hand processing in the right hemisphere. Healthy participants were submitted to a classic TMS paradigm to assess changes in corticospinal excitability of the right (Experiment 1) and left (Experiment 2) motor cortex, while viewing pictures of a (contralateral) still hand, which could either be their own (Self) or not (Other). As a control for body selectivity, subjects were also presented with pictures of a hand-related, but non-corporeal object, i.e. a mobile phone, which could similarly be their own or not. Results showed a selective right hemisphere increase in corticospinal excitability with self-hand and self-phone stimuli with respect to Other stimuli. Such a Self vs. Other modulation of primary motor cortex appeared at 600ms and was maintained at 900ms, but was not present at earlier timings (100 and 300ms) and was completely absent following stimulation of the left hemisphere. A similar pattern observed for self-hand and self-phone stimuli suggests that owned hands and objects may undergo similar self-processing, possibly via a different cortical network from that responsible for self-face processing.
机译：行为自我，神经心理学和神经影像学研究均获得了右半球额顶结构参与身体自我识别的支持。通过经颅磁刺激（TMS）增加皮质脊髓兴奋性也证明了右半球自我相关的过程。然而，运动兴奋性的自相关调节的证据仅限于处理与面部相关的信息，根据定义，该信息传达了某人的身份。在这里，我们检验了一个假设，即与他人的手的视觉相比，人的手的视觉也会在右半球进行特定的自手处理。健康的参与者接受了经典的TMS范例，以评估右（实验1）和左（实验2）运动皮层的皮质脊髓兴奋性的变化，同时查看（对侧）静止手的照片，这可能是他们自己的（自）或否（其他）。作为对身体选择性的控制，还向受试者展示了与手相关但非身体的物体（即手机）的图片，该图片可能是自己的也可能不是自己的。结果显示，相对于其他刺激，通过手和电话的刺激，选择性地增加了右半球的皮质脊髓兴奋性。初级运动皮层的这种自我对其他调制在600毫秒出现，并维持在900毫秒，但在较早的时间（100和300毫秒）不存在，并且在刺激左半球后完全消失。观察到的类似的关于手和电话自我刺激的模式表明，拥有的手和物体可能会经历类似的自我处理，可能通过与负责自我面部处理的皮质网络不同的皮质网络进行。

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