2011 Fiscal Year Final Research Report
Speech production mechanism in terms of individual difference in susceptibility to delayed auditory feedback effect
| Project/Area Number |
21520464
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Linguistics
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| Research Institution | Advanced Telecommunications Research Institute International |
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Principal Investigator |
NOTA Yukiko 株式会社国際電気通信基礎技術研究所, 知能ロボティクス研究所, 研究員 (60374104)
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| Co-Investigator(Kenkyū-buntansha) |
ICHINOSE Yutaka 九州産業大学, 情報科学部, 教授 (20352106)
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| Co-Investigator(Renkei-kenkyūsha) |
MASAKI Shinobu 株式会社国際電気通信基礎技術研究所, 知能ロボティクス研究所, 主幹研究員 (40181630)
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| Project Period (FY) |
2009 – 2011
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| Keywords | 言語の生物的基盤 |
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| Research Abstract |
When a speaker receives auditory feedback with a 200-ms delay, he/she tends to speak less fluently. This phenomenon is called a delayed auditory feedback(DAF) effect. Susceptibility to the effect, however, varies among individuals. We investigated brain activity during a reading task under DAF and normal auditory feedback(NAF) conditions using functional magnetic resonance imaging(fMRI) on subjects with different levels of susceptibility. By searching for the brain area correlated with DAF susceptibility, we found that the left precentral gyrus(BA6), medial frontal gyrus(BA6), left inferior frontal gyrus(BA45), and left anterior insula were activated in a way negatively correlated with the degree of DAF effect. These results suggest that during speech DAF-insusceptible subjects show improved motor planning and control for speech production under the DAF condition, thus achieving fluent speech compared to DAF-susceptible subjects.
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