Effects of visual stimulation on cortico-spinal coherence during isometric hand contraction in humans

The effects of visual stimuli on cortico-spinal synchronization were investigated by measuring the coherence between electroencephalogram (EEG) and electromyogram (EMG) during isometric contraction of the first dorsal interosseous muscle of the right hand. Because a spinal motoneuron and the corresp...

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Main Authors: Safri, Norlaili Mat, Murayama, Nobuki, Igasaki, Tomohiko, Hayashida, Yuki
Format: Article
Published: Elsevier BV 2006
Subjects:
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author Safri, Norlaili Mat
Murayama, Nobuki
Igasaki, Tomohiko
Hayashida, Yuki
author_facet Safri, Norlaili Mat
Murayama, Nobuki
Igasaki, Tomohiko
Hayashida, Yuki
author_sort Safri, Norlaili Mat
collection ePrints
description The effects of visual stimuli on cortico-spinal synchronization were investigated by measuring the coherence between electroencephalogram (EEG) and electromyogram (EMG) during isometric contraction of the first dorsal interosseous muscle of the right hand. Because a spinal motoneuron and the corresponding muscle fibers form a motor unit with one-to-one correspondence of their action potentials, the EMG indirectly measures the activity of the corresponding spinal neuronal group. The tasks were isometric contraction (Control condition); and isometric contraction with concurrent ignoring of visual stimuli (VS condition). By comparing the Control and VS conditions, the following results were obtained. The coherence increased significantly in magnitude, but was unchanged in frequency range (beta band) and scalp location; the EEG and EMG spectral power in the beta band were unchanged in amplitude; and the alpha and gamma bands of EEG spectral power were significantly increased and decreased, respectively. These findings suggest that the cortico-muscular coherence reflects the cognitive effort needed to maintain isometric muscle contraction. When visual stimuli need to be ignored, the cognitive effort and cortico-spinal coherence are enhanced.
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spelling utm.eprints-90802018-03-22T08:33:50Z http://eprints.utm.my/9080/ Effects of visual stimulation on cortico-spinal coherence during isometric hand contraction in humans Safri, Norlaili Mat Murayama, Nobuki Igasaki, Tomohiko Hayashida, Yuki TK Electrical engineering. Electronics Nuclear engineering The effects of visual stimuli on cortico-spinal synchronization were investigated by measuring the coherence between electroencephalogram (EEG) and electromyogram (EMG) during isometric contraction of the first dorsal interosseous muscle of the right hand. Because a spinal motoneuron and the corresponding muscle fibers form a motor unit with one-to-one correspondence of their action potentials, the EMG indirectly measures the activity of the corresponding spinal neuronal group. The tasks were isometric contraction (Control condition); and isometric contraction with concurrent ignoring of visual stimuli (VS condition). By comparing the Control and VS conditions, the following results were obtained. The coherence increased significantly in magnitude, but was unchanged in frequency range (beta band) and scalp location; the EEG and EMG spectral power in the beta band were unchanged in amplitude; and the alpha and gamma bands of EEG spectral power were significantly increased and decreased, respectively. These findings suggest that the cortico-muscular coherence reflects the cognitive effort needed to maintain isometric muscle contraction. When visual stimuli need to be ignored, the cognitive effort and cortico-spinal coherence are enhanced. Elsevier BV 2006 Article PeerReviewed Safri, Norlaili Mat and Murayama, Nobuki and Igasaki, Tomohiko and Hayashida, Yuki (2006) Effects of visual stimulation on cortico-spinal coherence during isometric hand contraction in humans. International Journal of Psychophysiology, 61 (2). pp. 288-293. ISSN 0167-8760 http://dx.doi.org/10.1016/j.ijpsycho.2006.03.003 10.1016/j.ijpsycho.2006.03.003
spellingShingle TK Electrical engineering. Electronics Nuclear engineering
Safri, Norlaili Mat
Murayama, Nobuki
Igasaki, Tomohiko
Hayashida, Yuki
Effects of visual stimulation on cortico-spinal coherence during isometric hand contraction in humans
title Effects of visual stimulation on cortico-spinal coherence during isometric hand contraction in humans
title_full Effects of visual stimulation on cortico-spinal coherence during isometric hand contraction in humans
title_fullStr Effects of visual stimulation on cortico-spinal coherence during isometric hand contraction in humans
title_full_unstemmed Effects of visual stimulation on cortico-spinal coherence during isometric hand contraction in humans
title_short Effects of visual stimulation on cortico-spinal coherence during isometric hand contraction in humans
title_sort effects of visual stimulation on cortico spinal coherence during isometric hand contraction in humans
topic TK Electrical engineering. Electronics Nuclear engineering
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