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Cerebral Cortex Advance Access published online on November 23, 2005
Cerebral Cortex, doi:10.1093/cercor/bhj075
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Article

Neural Correlates of the Spontaneous Phase Transition during Bimanual Coordination

Yu Aramaki 1, Manabu Honda 2, Tomohisa Okada 3, and Norihiro Sadato 4 *

1 Department of Cerebral Research, National Institute for Physiological Sciences, 38 Nishigonaka, Myodaijicho, Okazaki, Aichi 444-8585, Japan; Research Institute of Science and Technology for Society, Kawaguchi, Saitama 332-0012, Japan
2 Department of Cerebral Research, National Institute for Physiological Sciences, 38 Nishigonaka, Myodaijicho, Okazaki, Aichi 444-8585, Japan; Solution Oriented Research for Science and Technology, Japan Science and Technology Agency, Kawaguchi, Saitama 332-0012, Japan; Department of Cortical Function Disorders, National Institute of Neuroscience, National Center for Neurology and Psychiatry, Tokyo 187-8502, Japan
3 Department of Cerebral Research, National Institute for Physiological Sciences, 38 Nishigonaka, Myodaijicho, Okazaki, Aichi 444-8585, Japan
4 Department of Cerebral Research, National Institute for Physiological Sciences, 38 Nishigonaka, Myodaijicho, Okazaki, Aichi 444-8585, Japan; Research Institute of Science and Technology for Society, Kawaguchi, Saitama 332-0012, Japan; Department of Functional Neuroimaging, Faculty of Medical Sciences, University of Fukui, Fukui 910-1193, Japan

* To whom correspondence should be addressed.
Norihiro Sadato, E-mail: sadato{at}nips.ac.jp


  Abstract

Repetitive bimanual finger-tapping movements tend toward mirror symmetry: There is a spontaneous transition from less stable asymmetrical movement patterns to more stable symmetrical ones under frequency stress but not vice versa. During this phase transition, the interaction between the signals controlling each hand (cross talk) is expected to be prominent. To depict the regions of the brain in which cortical cross talk occurs during bimanual coordination, we conducted event-related functional magnetic resonance imaging using a bimanual repetitive-tapping task. Transition-related activity was found in the following areas: the bilateral ventral premotor cortex, inferior frontal gyrus, middle frontal gyrus, inferior parietal lobule, insula, and thalamus; the right rostral portion of the dorsal premotor cortex and midbrain; the left cerebellum; and the presupplementary motor area, rostral cingulate zone, and corpus callosum. These regions were discrete from those activated by bimanual movement execution. The phase-transition-related activation was right lateralized in the prefrontal, premotor, and parietal regions. These findings suggest that the cortical neural cross talk occurs in the distributed networks upstream of the primary motor cortex through asymmetric interhemispheric interaction.

Keywords: bimanual coordination; fMRI; interhemispheric interaction; spontaneous phase transition.
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M. J. Hayashi, D. N. Saito, Y. Aramaki, T. Asai, Y. Fujibayashi, and N. Sadato
Hemispheric Asymmetry of Frequency-Dependent Suppression in the Ipsilateral Primary Motor Cortex During Finger Movement: A Functional Magnetic Resonance Imaging Study
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