Dissociation of agency and body ownership following visuomotor temporal recalibration

Frontiers in Integrative Neuroscience

Shu eImaizumi²  Tomohisa eAsai³ 

[1] Chiba University;Japan Society for the Promotion of Science;NTT Corporation;

关键词: Time Perception;    action;    voluntary movement;    Bodily self-consciousness;    Proprioceptive drift;    sensorimotor processing;   

DOI  :  10.3389/fnint.2015.00035

来源: DOAJ

【 摘 要 】

Bodily self-consciousness consists of one’s sense of agency (I am causing an action) and body ownership (my body belongs to me). Both stem from the temporal congruence between different modalities, although some visuomotor temporal incongruence is acceptable for agency. To examine the association or dissociation between agency and body ownership in the context of different temporal sensitivities, we applied a temporal recalibration paradigm, in which subjective synchrony between asynchronous hand action and its visual feedback can be perceived after exposure to the asynchronous visuomotor stimulation. In the experiment, participants continuously clasped and unclasped their hand while watching an online video of their hand that was presented with delays of 50, 110, 170, 230, 290, and 350 ms. Then, they rated a video of their hand with a delay of 50 ms (test stimulus) with respect to the synchrony between hand action and hand video and the perceived agency over the video. Moreover, proprioceptive drift of participants’ hand location toward the hand video during the exposure was measured as an index of illusory body ownership. Results indicated that perception of agency emerged over the delayed hand video as subjective visuomotor synchrony was recalibrated, but that body ownership did not emerge for the delayed video, even after the recalibration. We suggest that there is a dissociation between agency and body ownership following visuomotor temporal recalibration.

【 授权许可】

Unknown