Effects of concurrent visual tasks on cortico-muscular synchronization in humans
To study the effects of external visual stimulation on motor cortex-muscle synchronization, coherence between electroencephalography (EEG) and electromyography (EMG) was measured in normal subjects under Before, Task (visual task: Ignore or Count, or arithmetic task) and After conditions. The contro...
| Main Authors: | , , , |
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| Format: | Book Section |
| Language: | English |
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Elsevier B.V.
2007
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| Online Access: | http://eprints.utm.my/9617/1/NorlailiMatSafri2007_EffectsOfConcurrentVisualTasks.pdf |
| _version_ | 1796854548349845504 |
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| author | Mat Safri, Norlaili Murayama, Nobuki Hayashida, Yuki Igasaki, Tomohiko |
| author_facet | Mat Safri, Norlaili Murayama, Nobuki Hayashida, Yuki Igasaki, Tomohiko |
| author_sort | Mat Safri, Norlaili |
| collection | ePrints |
| description | To study the effects of external visual stimulation on motor cortex-muscle synchronization, coherence between electroencephalography (EEG) and electromyography (EMG) was measured in normal subjects under Before, Task (visual task: Ignore or Count, or arithmetic task) and After conditions. The control (Before and After) conditions required the subject to maintain first dorsal interosseous muscle contraction without visual stimulation. In the visual task, a random series of visual stimuli were displayed on a screen while the subjects maintained the muscle contraction. The subjects were asked to ignore the stimuli in the Ignore condition and to count certain stimuli in the Count condition. Also, in the arithmetic task, the subjects were asked to perform a simple subtraction. The EEG“EMG coherence found at C3 site at 13“30 Hz (beta) was increased and sustained in magnitude during the Ignore and Count conditions, respectively. To examine the cause of the change of coherence, changes of EEG and EMG spectral power were computed for each frequency band. There was little change in the EMG spectral power in any frequency bands. While the spectral power of EEG unchanged in the beta band, it significantly increased and decreased in the range of 8–12 Hz and of 31–50 Hz, respectively, for both Ignore and Count conditions, not only at the C3 site but at various sites as well. These results were in contrast to those obtained for the arithmetic task: the beta band EEG“EMG coherence was attenuated and the EEG spectral power at 4“7 Hz and at 31“50 Hz were significantly increased and decreased, respectively. As a conclusion, the present results are consistent with the idea that the enhanced 8“12 Hz/decreased 31“50 Hz oscillations affect strength of the beta band cortico-muscular synchronization by suppressing the visual processing. |
| first_indexed | 2024-03-05T18:15:43Z |
| format | Book Section |
| id | utm.eprints-9617 |
| institution | Universiti Teknologi Malaysia - ePrints |
| language | English |
| last_indexed | 2024-03-05T18:15:43Z |
| publishDate | 2007 |
| publisher | Elsevier B.V. |
| record_format | dspace |
| spelling | utm.eprints-96172017-09-03T09:59:24Z http://eprints.utm.my/9617/ Effects of concurrent visual tasks on cortico-muscular synchronization in humans Mat Safri, Norlaili Murayama, Nobuki Hayashida, Yuki Igasaki, Tomohiko TK Electrical engineering. Electronics Nuclear engineering QM Human anatomy To study the effects of external visual stimulation on motor cortex-muscle synchronization, coherence between electroencephalography (EEG) and electromyography (EMG) was measured in normal subjects under Before, Task (visual task: Ignore or Count, or arithmetic task) and After conditions. The control (Before and After) conditions required the subject to maintain first dorsal interosseous muscle contraction without visual stimulation. In the visual task, a random series of visual stimuli were displayed on a screen while the subjects maintained the muscle contraction. The subjects were asked to ignore the stimuli in the Ignore condition and to count certain stimuli in the Count condition. Also, in the arithmetic task, the subjects were asked to perform a simple subtraction. The EEG“EMG coherence found at C3 site at 13“30 Hz (beta) was increased and sustained in magnitude during the Ignore and Count conditions, respectively. To examine the cause of the change of coherence, changes of EEG and EMG spectral power were computed for each frequency band. There was little change in the EMG spectral power in any frequency bands. While the spectral power of EEG unchanged in the beta band, it significantly increased and decreased in the range of 8–12 Hz and of 31–50 Hz, respectively, for both Ignore and Count conditions, not only at the C3 site but at various sites as well. These results were in contrast to those obtained for the arithmetic task: the beta band EEG“EMG coherence was attenuated and the EEG spectral power at 4“7 Hz and at 31“50 Hz were significantly increased and decreased, respectively. As a conclusion, the present results are consistent with the idea that the enhanced 8“12 Hz/decreased 31“50 Hz oscillations affect strength of the beta band cortico-muscular synchronization by suppressing the visual processing. Elsevier B.V. 2007-06 Book Section PeerReviewed application/pdf en http://eprints.utm.my/9617/1/NorlailiMatSafri2007_EffectsOfConcurrentVisualTasks.pdf Mat Safri, Norlaili and Murayama, Nobuki and Hayashida, Yuki and Igasaki, Tomohiko (2007) Effects of concurrent visual tasks on cortico-muscular synchronization in humans. In: Brain Research. Elsevier B.V., pp. 81-92. http://dx.doi.org/10.1016/j.brainres.2007.04.052 doi : 10.1016/j.brainres.2007.04.052 |
| spellingShingle | TK Electrical engineering. Electronics Nuclear engineering QM Human anatomy Mat Safri, Norlaili Murayama, Nobuki Hayashida, Yuki Igasaki, Tomohiko Effects of concurrent visual tasks on cortico-muscular synchronization in humans |
| title | Effects of concurrent visual tasks on cortico-muscular synchronization in humans |
| title_full | Effects of concurrent visual tasks on cortico-muscular synchronization in humans |
| title_fullStr | Effects of concurrent visual tasks on cortico-muscular synchronization in humans |
| title_full_unstemmed | Effects of concurrent visual tasks on cortico-muscular synchronization in humans |
| title_short | Effects of concurrent visual tasks on cortico-muscular synchronization in humans |
| title_sort | effects of concurrent visual tasks on cortico muscular synchronization in humans |
| topic | TK Electrical engineering. Electronics Nuclear engineering QM Human anatomy |
| url | http://eprints.utm.my/9617/1/NorlailiMatSafri2007_EffectsOfConcurrentVisualTasks.pdf |
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