Resource-demanding versus cost-effective bimanual interaction in the brain |
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Authors: | Yu Aramaki Rieko Osu Norihiro Sadato |
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Institution: | (1) Center for Fostering Young and Innovative Researchers, Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya Aichi, 466-8555, Japan;(2) Computational Neuroscience Sub-Group, Biological ITC Group, National Institute of Information and Communications Technology, 2-2-2 Hikaridai, Keihanna Science City, Kyoto 619-0288, Japan;(3) Department of Cerebral Research, National Institute for Physiological Sciences, 38 Nishigonaka, Myodaijicho, Okazaki Aichi, 444-8585, Japan;(4) ATR Computational Neuroscience Laboratories, 2-2-2 Hikaridai, Keihanna Science City, Kyoto 619-0288, Japan |
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Abstract: | When two hands require different information in bimanual asymmetric movements, interference can occur via callosal connections
and ipsilateral corticospinal pathways. This interference could potentially work as a cost-effective measure in symmetric
movements, allowing the same information to be commonly available to both hands at once. Using functional magnetic resonance
imaging, we investigated supra-additive and sub-additive neural interactions in bimanual movements during the initiation and
continuation phases of movement. We compared activity during bimanual asymmetric and symmetric movements with the sum of activity
during unimanual right and left finger-tapping. Supra-additive continuation-related activation was found in the right dorsal
premotor cortex and left cerebellum (lobule V) during asymmetric movements. In addition, for unimanual movements, the right
dorsal premotor cortex and left cerebellum (lobule V) showed significant activation only for left-hand (non-dominant) movements,
but not for right-hand movements. These results suggest that resource-demanding interactions in bimanual asymmetric movements
are involved in a non-dominant hand motor network that functions to keep non-dominant hand movements stable. We found sub-additive
continuation-related activation in the supplementary motor area (SMA), bilateral cerebellum (lobule VI) in symmetric movements,
and the SMA in asymmetric movements. This suggests that no extra demands were placed on these areas in bimanual movements
despite the conventional notion that they play crucial roles in bimanual coordination. Sub-additive initiation-related activation
in the left anterior putamen suggests that symmetric movements place lower demands on motor programming. These findings indicate
that, depending on coordination patterns, the neural substrates of bimanual movements either exhibit greater effort to keep
non-dominant hand movements stable, or save neural cost by sharing information commonly to both hands. |
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