SAMBA (SpAtial, Motor and Bodily Awareness) Research Group, Department of Psychology, University of Turin, 10123 Turin, Italy; NPSY-Lab.VR, Department of Human Sciences, University of Verona, 37129 Verona, Italy.
MANIBUS - Movement ANd body In Behavioral and physiological neUroScience research group, Department of Psychology, University of Turin, 10123 Turin, Italy.
Neuroimage. 2021 Apr 1;229:117727. doi: 10.1016/j.neuroimage.2021.117727. Epub 2021 Jan 9.
Sensory attenuation (i.e., the phenomenon whereby self-produced sensations are perceived as less intense compared to externally occurring ones) is among the neurocognitive processes that help distinguishing ourselves from others. It is thought to be rooted in the motor system (e.g., related to motor intention and prediction), while the role of body awareness, which necessarily accompanies any voluntary movement, in this phenomenon is largely unknown. To fill this gap, here we compared the perceived intensity, somatosensory evoked potentials, and alpha-band desynchronization for self-generated, other-generated, and embodied-fake-hand-generated somatosensory stimuli. We showed that sensory attenuation triggered by the own hand and by the embodied fake hand had the same behavioral and neurophysiological signatures (reduced subjective intensity, reduced of N140 and P200 SEP components and post-stimulus alpha-band desynchronization). Therefore, signals subserving body ownership influenced attenuation of somatosensory stimuli, possibly in a postdictive manner. This indicates that body ownership is crucial for distinguishing the source of the perceived sensations.
感觉减弱（即，与外部发生的感觉相比，自我产生的感觉被感知为强度降低的现象）是帮助将自我与他人区分开来的神经认知过程之一。它被认为植根于运动系统（例如，与运动意图和预测有关），而身体意识在这种现象中的作用（必然伴随着任何自愿运动）在很大程度上是未知的。为了填补这一空白，我们在这里比较了自我产生、他人产生和体现假手产生的躯体感觉刺激的感知强度、体感诱发电位和 alpha 频带去同步化。我们表明，由自己的手和体现假手触发的感觉减弱具有相同的行为和神经生理特征（主观强度降低，N140 和 P200 SEP 成分减少，以及刺激后 alpha 频带去同步化）。因此，支持身体所有权的信号影响躯体感觉刺激的减弱，可能是以预测后方式。这表明身体所有权对于区分感知感觉的来源至关重要。
