文章基本信息

标题：Efference Copy Is Necessary for the Attenuation of Self-Generated Touch
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作者：Konstantina Kilteni ; Patrick Engeler ; H. Henrik Ehrsson 等
期刊名称：iScience
印刷版ISSN：2589-0042
出版年度：2020
卷号：23
期号：2
页码：1-18
DOI：10.1016/j.isci.2020.100843
语种：English
出版社：Elsevier
摘要：SummarySelf-generated touch feels less intense than external touch of the same intensity. According to theory, this is because the brain predicts and attenuates the somatosensory consequences of our movements using a copy of the motor command, i.e., the efference copy. However, whether the efference copy is necessary for this somatosensory attenuation is unclear. Alternatively, a predictable contact of two body parts could be sufficient. Here we quantified the attenuation of touch applied on the participants' left index finger when the touch was triggered by the active or passive movement of the right index finger and when it was externally generated. We observed attenuation only when the touch was triggered by the participants' active movement. In contrast, during the passive movement, the touch was perceived to be as strong as when the touch was externally triggered. Our results suggest that the efference copy is necessary for the attenuation of self-generated touch.Graphical AbstractDisplay OmittedHighlights•Self-touch by active movement feels weaker than external touch•Self-touch by passive movement feels as intense as external touch•Efference copy is necessary for predicting and attenuating self-generated touch•Our findings support the internal forward model theory of sensory attenuationBiological Sciences; Neuroscience; Sensory Neuroscience