1998 Fiscal Year Final Research Report Summary
Basic and clinical research on speech perception and production
| Project/Area Number |
09557135
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 展開研究 |
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| Research Field |
Otorhinolaryngology
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| Research Institution | KYOTO UNIVERSITY |
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Principal Investigator |
HONJO Iwao Kyoto University, Hearing and Speech Science, Professor, 医学研究科, 教授 (00077653)
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| Co-Investigator(Kenkyū-buntansha) |
SHOJI Kazuhiko Kyoto University, Hearing and Speech Science, Assistant Professor, 医学研究科, 講師 (60196582)
NAITO Yasushi Kyoto University, Hearing and Speech Science, Assistant Professor, 医学研究科, 講師 (70217628)
TAKAHASHI Haruo Kyoto University, Hearing and Speech Science, Assistant Professor, 医学研究科, 講師 (90171511)
KOJIMA Hisayoshi Kyoto University, Hearing and Speech Science, Associate Professor, 医学研究科, 助教授 (10127079)
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| Project Period (FY) |
1997 – 1998
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| Keywords | Speech perception / Vocalization / Functional brain imaging / PET / Cochlear implant / Auditory feedback |
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| Research Abstract |
We examined central processing mechanism for speech perception and production using functional brain image such as positron emission tomography (PET) in subjects of hearing impairment and speech disorder as well as normal subjects. Postlingu ally deafened subjects indicated rather identical activation of auditory association areas with normal subjects. But, more activation was observed in cingulate gyms and supplementary motor area in deaf subjects. The brain imaging of prelingually deafened subjects showed quite different pattern. Most cases showed little activation in the auditory association areas by listening to speech sounds via cochlear implant. On the other hand, the auditory association areas were activated by lipreading in some prelingually deafened subjects. These results imply that the brain differentiation should differ according to verbal environment during speech acquisition period.
As for vocalization, Broca* area, motor area, supplementary motor area, the cerebellum were important for output of speech. However, the auditory association areas were not activated during vocalization, which indicated that auditory feedback system was not needed to perform daily conversational vocalization. In contrast, when one* speech was distorted, the auditory association areas became to be activated, which implied the feedback system to repair vocalization. This situation is similar to that during speech acquisition period.
In conclusion, we can observe various patterns of cortical processing mechanisms according to the situation of verbal environment.
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