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首页> 外文期刊>The European Journal of Neuroscience >The effects of transcranial direct current stimulation on conscious perception of sensory inputs from hand palm and dorsum
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The effects of transcranial direct current stimulation on conscious perception of sensory inputs from hand palm and dorsum

机译：经颅直流电刺激对手掌和背部感觉输入的有意识感知的影响

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Conscious perception of sensory signals depends in part on stimulus salience, relevance and topography. Letting aside differences at skin receptor level and afferent fibres, it is the CNS that makes a contextual selection of relevant sensory inputs. We hypothesized that subjective awareness (AW) of the time at which a sensory stimulus is perceived, a cortical function, may be differently modified by cortical stimulation, according to site and type of the stimulus. In 24 healthy volunteers, we examined the effects of transcranial direct current stimulation (tDCS) on the assessment of AW to heat pain or weak electrical stimuli applied to either the hand palm or dorsum. We also recorded the vertex-evoked potentials to the same stimuli. The assessment was done before, during and after cathodal or anodal tDCS over the parietal cortex contralateral to the hand receiving the stimuli. At baseline, AW to thermal stimuli was significantly longer for palm than for dorsum (P<0.01), while no differences between stimulation sites were observed for the electrical stimuli. Both cathodal and anodal tDCS caused a significant shortening of AW to thermal stimuli in the palm but not in the dorsum, and no effects on AW to electrical stimuli. Longer AW in the palm than in the dorsum may be attributable to differences in skin thickness. However, the selectivity of the effects of tDCS on AW to thermal stimulation of the glabrous skin reflects the specificity of CNS processing for site and type of sensory inputs.
机译：感觉信号的自觉感知部分取决于刺激的显着性，相关性和地形。除了皮肤受体水平和传入纤维方面的差异外，CNS可以根据上下文选择相关的感觉输入。我们假设，根据刺激的部位和类型，皮层刺激可能会不同地改变感知感觉刺激的时间（皮质功能）的主观意识（AW）。在24名健康志愿者中，我们检查了经颅直流电刺激（tDCS）对AW对手掌或背部施加的热痛或弱电刺激的评估。我们还记录了相同刺激的顶点诱发电位。在接受刺激的手对侧的顶叶皮质的阴极或阳极tDCS之前，期间和之后进行评估。在基线时，手掌的AW对热刺激的时间明显长于背侧（P <0.01），而电刺激的刺激部位之间没有差异。阴极和阳极的tDCS都引起手掌对热刺激的AW显着缩短，但在背侧却没有，并且对电刺激对AW没有影响。手掌中的AW比背部中的AW更长，可能是由于皮肤厚度的差异所致。但是，tDCS对AW对无刺激性皮肤热刺激的影响的选择性反映了CNS处理对于感觉输入部位和类型的特异性。

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