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A magnetoencephalographic study of sensorimotor activity differences during unilateral and bilateral forearm movements

Nakagawa, Keia; Fushimi, Takeshia; Hashizume, Akirab; Kakigi, Ryusukec; Kurisu, Kaorub; Yuge, Louisa

International Journal of Rehabilitation Research: September 2010 - Volume 33 - Issue 3 - p 254-260
doi: 10.1097/MRR.0b013e328333de7d
Brief research reports

This study compared activation of the sensorimotor area using magnetoencephalography after unilateral and bilateral movements. Thirteen healthy individuals and a patient with mild hemiplegia performed unilateral and bilateral forearm pronation movements. Among healthy participants, there were no significant differences in motor-evoked field during unilateral and bilateral movements, and equivalent current dipoles were located around the sensorimotor area. In the patient, motor-evoked field was measured in the lesional hemisphere clearly during bilateral movements, and the locus of equivalent current dipoles was estimated to be around the mean location in healthy individuals. In contrast, unilateral movements were estimated outside the area of sensorimotor activation. We speculate that bilateral movements may be more effective for functional recovery during rehabilitation.

aDivision of Bio-Environmental Adaptation Sciences, Graduate School of Health Sciences

bDepartment of Neurosurgery, Hiroshima University, Hiroshima

cDepartment of Integrative Physiology, National Institute for Physiological Sciences, Okazaki, Japan

Correspondence to Louis Yuge, PhD, Division of Bio-Environmental Adaptation Sciences, Graduate School of Health Sciences, Hiroshima University, 1-2-3 Kasumi Minami-ku, Hiroshima 734-8551, Japan

Tel: +81 82 257 5425; fax: +81 82 257 5344; e-mail:

Received 20 July 2009 Accepted 1 October 2009

© 2010 Lippincott Williams & Wilkins, Inc.