Muscle-afferent projection to the sensorimotor cortex after voluntary movement and motor-point stimulation: An MEG study

Abstract Objective To investigate the projection of muscle afferents to the sensorimotor cortex after voluntary finger movement by using magnetoencephalography (MEG). Methods The movement-evoked magnetic fields (MEFs) after voluntary index-finger extension were recorded by a 204-channel whole-head M...

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Bibliographic Details
Published in:Clinical neurophysiology 2011-03, Vol.122 (3), p.605-610
Main Authors: Onishi, Hideaki, Oyama, Mineo, Soma, Toshio, Kirimoto, Hikari, Sugawara, Kazuhiro, Murakami, Hiroatsu, Kameyama, Shigeki
Format: Article
Language:English
Subjects:
Adult
Biological and medical sciences
Data Interpretation, Statistical
Electric Stimulation
Electrodiagnosis. Electric activity recording
Electroencephalography
Evoked Potentials, Somatosensory - physiology
Female
Fingers - innervation
Fingers - physiology
Fundamental and applied biological sciences. Psychology
Humans
Investigative techniques, diagnostic techniques (general aspects)
M70
Magnetoencephalography
Male
Medical sciences
MEF1
MEG
Middle Aged
Motor control and motor pathways. Reflexes. Control centers of vegetative functions. Vestibular system and equilibration
Motor Cortex - physiology
Motor-point stimulation
Movement - physiology
Muscle Contraction - physiology
Muscle, Skeletal - innervation
Muscle, Skeletal - physiology
Nervous system
Neurology
Neurons, Afferent - physiology
Somatosensory Cortex - physiology
Vertebrates: nervous system and sense organs
Voluntary contraction
Young Adult
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Summary:Abstract Objective To investigate the projection of muscle afferents to the sensorimotor cortex after voluntary finger movement by using magnetoencephalography (MEG). Methods The movement-evoked magnetic fields (MEFs) after voluntary index-finger extension were recorded by a 204-channel whole-head MEG system. Somatosensory-evoked magnetic fields (SEFs) were recorded after motor-point stimulation was applied to the right extensor indicis muscle by using a pair of wire electrodes. Results The MEF waveforms were observed at 35.8 ± 9.7 ms after movement onset (MEF1). The most concentrated SEFs were identified at 78.7 ± 5.6 ms (M70), and the onset latency of M70 was 39.0 ± 5.5 ms after motor-point stimulation. The mean locations of the equivalent current dipoles (ECDs) of MEF1 and M70 were significantly medial and superior to that of N20m elicited by median-nerve stimulation. The ECD locations and directions of both MEF1 and M70 were concordant in the axial, coronal and sagittal planes. Conclusions MEF1 and M70 might be elicited by muscle-afferent feedback following muscle contraction. In addition, these ECDs may be located in area 4. Significance Motor-point stimulation is a useful tool for confirming the projection of muscle-afferent feedback to the sensorimotor cortex after voluntary movement.
ISSN:1388-2457
1872-8952
DOI:10.1016/j.clinph.2010.07.027