| Project/Area Number |
17K01615
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Developmental mechanisms and the body works
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| Research Institution | Osaka University |
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Principal Investigator |
Morita Tomoyo 大阪大学, 先導的学際研究機構, 特任准教授(常勤) (60543402)
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| Project Period (FY) |
2017-04-01 – 2020-03-31
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| Project Status |
Completed (Fiscal Year 2019)
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| Budget Amount *help |
¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2019: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2018: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Fiscal Year 2017: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
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| Keywords | 自己顔 / 機能的MRI / 脳発達 / 高次視覚野 / 言語 / 発達 / 下側頭回 / 単語 / 自己認知 / 脳機能 / MRI / 右半球 |
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| Outline of Final Research Achievements |
One’s own face is a special symbol of the self. In fact, the human brain has a higher-order visual cortex (self-face area) that specializes in the processing of self-face. In adults, this self-face area is known to be lateralized in the right hemisphere. In the present study, we investigated how and when the self-face area develops. We measured brain activity when children (8-11 years), adolescents (12-15 years) and younger adults (20-24 years) viewed self-face images and those of others by using functional MRI. We found that the self-face area is formed in the right hemisphere after the mid-teens. We also showed that this visual cortex goes through a developmental process in which it responds to all faces (one's own and others' faces) in the early teens, but after the mid-teens, the response to other faces is suppressed, resulting in emergence of selective response to one's own face.
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| Academic Significance and Societal Importance of the Research Achievements |
本研究では、自分の顔を専門的に処理する視覚領域（自己顔領域）は、小学生や中学生の時期には認められなかったことから、10代半ば以降に形成されることが明らかとなった。これは予想以上にゆっくりとした発達であり、10代半ばで成人と同程度に成熟すると考えられている高次連合野（右半球下前頭-頭頂領域）に位置する自己認知ネットワークよりも遅れて、自己顔領域が成熟することを意味する。脳の発達において、感覚領野は高次連合野よりも早く発達が進行し、成人様に成熟するというのが定説であるが、こうした見方に一石を投じる新しい知見と言える。
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