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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Notes
Note that sensory attenuation associated with self-touch is unlikely to provide a full explanation of our results because it has been found not to vary with the intensity of self-generated input (Bays and Wolpert 2007).
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Acknowledgments
The authors thank Christa Engelhardt, Henrik Grunert, Wenke Moehring, Andreas Romeyke, Nadine Seeger, and Kerstin Traeger for technical assistance. The experiments reported in this article were carried out in compliance with current German federal laws.
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Keller, P.E., Ishihara, M. & Prinz, W. Effects of feedback from active and passive body parts on spatial and temporal parameters in sensorimotor synchronization. Cogn Process 12, 127–133 (2011). https://doi.org/10.1007/s10339-010-0361-0
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DOI: https://doi.org/10.1007/s10339-010-0361-0