Effects of feedback from active and passive body parts on spatial and temporal parameters in sensorimotor synchronization |
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Authors: | Peter E Keller Masami Ishihara Wolfgang Prinz |
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Institution: | (1) Max Planck Institute for Human Cognitive and Brain Sciences, Stephanstr. 1a, 04103 Leipzig, Germany |
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Abstract: | Previous research on sensorimotor synchronization has manipulated the somatosensory information received from the tapping
finger to investigate how feedback from an active effector affects temporal coordination. The current study explored the role
of feedback from passive body parts in the regulation of spatiotemporal motor control parameters by employing a task that
required finger tapping on one’s own skin at anatomical locations of varying tactile sensitivity. A motion capture system
recorded participants’ movements as they synchronized with an auditory pacing signal by tapping with the right index finger
on either their left index fingertip (Finger/Finger) or forearm (Finger/Forearm). Results indicated that tap timing was more
variable, and movement amplitude was larger and more variable, when tapping on the finger than when tapping on the less sensitive
forearm. Finger/Finger tapping may be impaired relative to Finger/Forearm tapping due to ambiguity arising through overlap
in neural activity associated with tactile feedback from the active and the passive limb in the former. To compensate, the
control system may strengthen the assignment of tap-related feedback to the active finger by generating correlated noise in
movement kinematics and tap dynamics. |
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Keywords: | |
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