2003 Fiscal Year Final Research Report Summary
Organization of the Brain Mechanism for Speech Communication and Its Developmental Disorders
| Project/Area Number |
12470352
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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 | 一般 |
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| Research Field |
Otorhinolaryngology
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| Research Institution | Hiroshima Prefectural College of Health Sciences (2001-2003)
The University of Tokyo (2000) |
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Principal Investigator |
IMAIZUMI Satoshi Hiroshima Prefectural College of Health Sciences, Department of Communication Sciences and Disorders, Professor, 保健福祉学部・コミュニケーション障害学科, 教授 (80122018)
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| Co-Investigator(Kenkyū-buntansha) |
YOKOTA Norio Hiroshima Prefectural College of Health Sciences, Department of Occupational Therapy, Professor, 保健福祉学部・作業療法学科, 教授 (70230646)
DEGUCHI Toshisada Tokyo Gagugei University, Department of Education, Professor, 教育学部, 教授 (50143623)
HOSOI Hiroshi Nara Medical University, Department of Ptplaryngology, Professor, 医学部, 教授 (80094613)
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| Project Period (FY) |
2000 – 2003
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| Keywords | Communication / Brain mechanism / Development / Functional MRI / Screening / Theory of Mind / Emotion / Intention |
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| Research Abstract |
We studied the brain mechanism for speech communication by developing a screening system to detect communication problems in understanding speakers' real but sometimes hidden intentions. The screening system randomly presents a spoken phrase from a database of various phrases with four different intentions, praise, sarcasm, banter and blame. These were phrases with positive or negative linguistic meanings uttered warmheartedly or coldheartedly by four speakers. The screening system measures subject's response time and correctness score for judgment of speaker's intention as emotional valence of randomly presented stimuli. The screening test was carried out for 339 subjects (173 male and 166 female) of 6 to 24 years of age. The correctness scores significantly increased with age for sarcastic and banter/jocular phrases which have inconsistent linguistic and emotional valences, and the scores of junior high school students did not reach the level of the adult subjects. Female children sh
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owed faster development than male children. These results suggest that the ability to understand a speaker's hidden but true intensions by separating and integrating linguistic and emotional valences develops slower than estimated by conventional theory-of-mind tests based on false belief tasks. We also analyzed the brain mechanism for understanding speaker's intentions using fMRI images obtained from subjects who were performing the judgment of speaker's intention. The results of the fMRI analyses suggest that neural resources responsible for reading the speakers' intention are distributed over the superior temporal sulci (STS), inferior frontal regions, medial frontal regions and posterior cerebellum. When compared to the female subjects, the male subjects showed significantly stronger activation only in the right frontomedian cortex, which can be hypothesized to infer the speaker's hidden but true intentions from the speaking acts. These results suggest that neural processes for language and emotional prosody significantly interact to mentalize verbal acts, and sex differences exist in this mind reading system. The developed screening system is now being used to detect and evaluate communication problems for young children, and screening results suggest that this system is useful to evaluate the development of communication ability which is necessary to establish a smooth social human relationship. Less
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[Journal Article] Organization of the brain for the understanding speaker hidden but true intentions.2004
Author(s)
Satoshi Imaizumi, Midori Homma, Yuki Noguchi, Yoshiaki Ozawa, Masaharu Maruishi, Hiroyuki Muranaka
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Journal Title
Special Lecture, Communication Disorders and Speech Sciences, Proceedings of the 2nd International Conference on Speech Sciences (ICSS2004)(Incon Memorial Hall, Korea University)(Seoul, Korea, 2004)
Pages: 11-20
Description
「研究成果報告書概要(欧文)」より
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