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J Phys Ther Sci. 2019 May;31(5):424-428. doi: 10.1589/jpts.31.424. Epub 2019 May 10.

Modified feedback-control task for examining the relationship between sense of agency and motor control: a pilot study.

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Department of Neurorehabilitation, Graduate School of Health Science, Kio University: 4-2-2 Umami-naka, Koryo-cho, Kitakaturagi-gun, Nara 635-0832, Japan.
Department of Rehabilitation, Ishikawa Hospital, Japan.
Neurorehabilitation Research Center, Kio University, Japan.


[Purpose] A sense of agency and feedback control may be related when the sensory feedback is attributed to the self; however, the relationship between sense of agency and movement disorders remains unclear. Although a feedback-control task might enable the examination of this relationship, it may be difficult for patients with movement disorders to complete this task. The present study modified the feedback-control task for future clinical research. [Participants and Methods] Twenty-four healthy adults participated in the study. The basic procedure followed that of a previous study in which participants traced a target line while receiving visual feedback of their actual or fake movement. The task was modified to reduce the width of the movement area, change the shape of the line from sinusoidal to horizontal, and reduce the number of trials from 45 to 15. [Results] When participants received the visual feedback of their actual movement, the movement error significantly decreased, whereas when participants received the fake movement that represented pre-recordings of their previous own movements, the movement error significantly increased. [Conclusion] The results partially agreed with those of the previous study. This modified task might help in examining the relationship between sense of agency and movement disorders in terms of motor control.


Forward model; Motor control; Sense of agency

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