Neurophysiological study of motor control mechanisms of human brain

• Project/Area Number: 10670614
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Neurology
• Research Institution: National Institute for Physiological Sciences, Okazaki National Research Institute
• Principal Investigator: KAKIGI Ryuske (1999) Institute for Physiological Sciences, Department of Integrative Physiology, Professor, 生理学研究所, 教授 (10145196); 寶珠山 稔 (1998) 岡崎国立共同研究機構, 生理学研究所, 助手 (30270482)
• Co-Investigator(Kenkyū-buntansha): KOYAMA Sachiko Institute for Physiological Sciences, Department of Integrative Physiology, Assistant Researcher, 生理学研究所, 助手 (40270483) ; KANEOKE Yoshiki Institute for Physiological Sciences, Department of Integrative Physiology, Associate Professor, 生理学研究所, 助教授 (20280589) ; HOSHIYAMA Minoru Nagoya University, Department of Health Sciences, Lecturer, 医学部, 講師 (30270482) ; 柿木 隆介 岡崎国立共同研究機構, 生理学研究所, 教授 (10145196)
• Project Period (FY): 1998 – 1999
• Project Status: Completed (Fiscal Year 1999)
• Budget Amount: ¥3,100,000 (Direct Cost: ¥3,100,000); Fiscal Year 1999: ¥1,100,000 (Direct Cost: ¥1,100,000); Fiscal Year 1998: ¥2,000,000 (Direct Cost: ¥2,000,000)
• Keywords: voluntary movement / evoked potentials / magnetoencephalography / transcranial magnetic stimulation / movement-related cortical potentials / 体性感覚誘発電位 / SEP / 磁気刺激 / 誘発筋電図 / ヒト

Research Abstract

We studied the various activities of motor and sensory cortices during voluntary movement of humans using non-invasive neurophysiological techniques.
l) Changes of somatosensory evoked brain responses during voluntary movement: Changes of somatosensory evoked potentials (SEP) and magnetic fields (SEF) during voluntary movement were investigated. We confirmed that the early SEP component (N20) was linked with the activation of the motor cortex followed by actual movement, while other components up to 33 ms after stimulation were related to the preparation or the attention to the voluntary movement. We also confirmed that the amount of sensory activity was related to the complexity of the voluntary movement.
2) Activity of motor cortex during preparatory period: We investigated the activity of motor cortex and pyramidal tract during preparatory period to voluntary movement using transcranial magnetic stimulation (TMS). We confirmed that the inhibitory response after TMS relatively decreased, relating to the preparation for voluntary movement.
3) Vocalization related brain response and auditory activity: We succeeded to extract the auditory brain activity from the auditory related brain potential complex, and identified the generators for vocalization and auditory activity in the cortex.

Research Products

• [Publications] Hoshiyama M, Sheean G.: "Changes of somatosensory evoked potentials preceding rapid voluntary movement in Go/No-go choice reaction time task"Brain Research, Cognitive Brain Research. 7. 137-142 (1998)
• [Publications] Brecelj Y, Kakigi R, Koyam S, Hoshiyama M.: "Visual evoked magnetic responses to central and peripheral stimulation : simultaneous VEP recordings"Brain Topography. 10. 227-237 (1998)
• [Publications] Hoshiyama M, Kakigi R, Nagata O.: "Peripheral nerve conduction recorded by a micro gradiometer system (micro-SQUID) in humans"Neuroscience Letters. 272. 199-202 (1999)
• [Publications] Hoshiyama M, Kakigi R: "Shortening of the cortical silent period following transcranial magnetic brain stimulation during an experimental paradigm for generating CNV"Clincal Neurophysiology. 110. 1394-1398 (1999)
• [Publications] Hoshiyama M, Kakigi R.: "Changes of somatosensory evoked potentials during writing with the dominant and non-dominant hands"Brain Research. 833. 10-19 (1999)
• [Publications] Gunji A, Kakigi R, Hoshiyama M.: "Spatiotemporal analysis of vocalization-associated magnetic fields"Brain Research, Cognitive Brain Research. (印刷中). (2000)
• [Publications] Minoru Hoshiyama et al.: "Changes of somatoseusory evoked poteutials preceding rapid voluntary mouement in Go/No-go choice reaction time task." Brain Res.Cognitive Brain Res.7. 137-142 (1998)
• [Publications] Minoru Hoshiyama et al.: "Shortening of the certical sileut period following tramscranial wagnetic stimulation" Clinical Neurophysiology. (in press). (1999)
• [Publications] Minoru Hoshiyama et al.: "Changes of SEP during writing with dominant and uon-domihant hauds." Brain Research. (in press). (1999)
• [Publications] Minoru Hoshiyama: "Special Supplement of EEG Jourual (仮題)-6th IEPS" Elsevier Science,Amsterdam(in press), (1999)