1989 Fiscal Year Final Research Report Summary
Central nervous control of articulation
| Project/Area Number |
62440072
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| Research Category |
Grant-in-Aid for General Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Research Field |
Functional basic dentistry
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| Research Institution | Hokkaido University |
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Principal Investigator |
KAMEDA Kazuo Hokkaido Univ, Dept. Physiol, Professor, 歯学部, 教授 (70018414)
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| Co-Investigator(Kenkyū-buntansha) |
KAMADA Tsutomu Hokkaido Univ, Dept. Physiol, Instructor, 歯学部, 助手 (20091431)
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| Project Period (FY) |
1987 – 1989
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| Keywords | Articulation / Central nervous control / EEG topography / EEG |
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| Research Abstract |
Evolution of the humans depended on speech, and elaboration of speech was only possible with articulation; oral movement for production of various phonemes. The central nervous mechanism of articulation is closely tied up with the speech perception. So, many locations of cerebral cortex is put into action when speaking. Recently EEG topography technique were developed, and simultaneous electrical activities of the brain can be analyzed. We tried this technique for analysis of central mechanism of articulation.
Subjects for experiments were health young adults. Eventually the all were right-handed, and no other special test for their cerebral dominance were performed. They were given various tasks: listening to speech(familiar Japanese), listening to music, listening to unknown foreign language, and mental calculation. EEG during these mental tasks were, when compared to no-task, rest state, lower in voltage and faster in frequency. alpha-supression and beta-potentiation were shown in EEG topography, but the former were more prominent. Temporoparietal and temporooccipital portions showed this tendency most conspicuously. Dominance of left hemisphere was observed among these portions. Although more details were to be investigated, EEG topography is a very promising tool for analysis of articulation and other speech activities.
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