The neurophysiological processes reflecting body illusions such as the rubber hand remain debated. In particular, previous studies investigating neural responses evoked by the illusion-inducing stimuli provide diverging reports as to when these responses reflect the illusory state. To resolve these controversies in previous work we applied multivariate (cross-) classification to EEG responses obtained during the rubber hand illusion and multiple control conditions in human participants. These controls were designed to test for markers of the illusory state that generalize across the spatial arrangements of limbs or the specific nature of the control condition (rubber hand or participant’s real hand) - hence which are independent of the precise experimental conditions used as contrast for the illusion. This revealed a parcellation of evoked responses into a temporal sequence of events that each differentiate the illusion and control conditions along distinct dimensions. Importantly, around 130-150 ms following stimulus onset the neurophysiological signals reliably differentiated the illusory-state from all non-illusion epochs. This neurophysiological signature was not correlated with changes in skin conductance accompanying the illusion, suggesting that neurophysiological and bodily signals reflect distinct illusion-related processes.

中文翻译：

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橡胶手幻觉过程中感觉诱发反应的暂时消退揭示了操纵和幻觉特定的相关性

反映身体错觉（例如橡胶手）的神经生理过程仍存在争议。特别是，以前的研究调查了由幻觉诱导的刺激引起的神经反应，有关这些反应何时反映幻觉状态的报道存在分歧。为了解决以前的工作中的这些争议，我们对橡胶手错觉和人类参与者的多种控制条件下获得的脑电图反应进行了多元（交叉）分类。这些控件旨在测试虚幻状态的标记，这些标记在四肢的空间排列或控制条件（橡胶手或参与者的真实手）的特定性质中普遍存在-因此与用于对比的精确实验条件无关幻觉。这揭示了诱发反应的片段化为事件的时间序列，每个事件沿不同的维度区分错觉和控制条件。重要的是，在刺激发作后约130-150毫秒，神经生理信号可靠地将错觉状态与所有非错觉时期区分开。这种神经生理学特征与伴随幻觉的皮肤电导率变化不相关，表明神经生理学和身体信号反映了与幻觉有关的不同过程。