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Brain oscillations in its physiology and pathophysiology

開催日 2014/9/11
時間 9:00 - 11:00
会場 Room C(502)
Chairperson(s) 池田 昭夫 / Akio Ikeda (京都大学大学院医学研究科 てんかん・運動異常生理学講座 / Department of Epilepsy, Movement Disorders and Physiology, Kyoto University Graduate School of Medicine, Japan)
美馬 達哉 / Tatsuya Mima (京都大学大学院医学研究科附属脳機能総合研究センター / Human Brain Research Center, Kyoto University Graduate School of Medicine, Japan)

Social interaction represented by Inter-individual neural synchronization

  • S1-C-1-3
  • 小池 耕彦 / Takahiko Koike:1 田邊 宏樹 / Hiroki Tanabe:1,2 岡崎 俊太郎 / Shuntaro Okazaki:1,3 Bosch Jorge / Jorge Bosch:1 定藤 規弘 / Norihiro Sadato:1 
  • 1:生理研 大脳皮質機能研究系 心理生理学研究部門 / National Institute for Physiological Sciences, Aichi, Japan 2:名古屋大学大学院 環境学研究科 / Graduate School of Environmental Studies, Nagoya University, Nagoya, Japan 3:Cuban Neuroscience Center, Habana, Cuba / Cuban Neuroscience Center, Habana, Cuba 

Joint attention (JA) is a social ability for individuals to share their attention towards an object simultaneously, and it is important to provides a communicative link between humans. JA facilitates some form of pair-specific communication. Previous hyper-scanning functional MRI showed inter-individual neural synchronization in the right inferior frontal gyrus (IFG) during JA tasks after modeling-out all task-related effects (Saito et al., 2010). This raised the possibility that the inter-individual synchronization during eye contact represents an internal model of JA shared by the pair. We hypothesize that JA forms a pair-specific, shared internal model for motor and perceptual actions via closed-loop interaction. We predict that the inter-individual neural synchronization that represents the internal model can be strengthened by performing the JA task. To test this hypothesis, we conducted 2-day hyperscanning fMRI with 94 normal volunteers. In day one, pairs of participants performed a real-time mutual gaze first, followed by JA task. In day two, the pair performed a real-time mutual gaze again. The fMRI with JA task showed that IFG was involved in two components of joint attention: creating a shared point of reference (initiation), and following the direction of gaze, enabling shared attention towards an object (response). Experiencing JA with a partner enhanced the neural synchronization of the right IFG during eye-contact in a pair-specific manner. This is the first study to provide neuroanatomical evidence for the shared internal model constructed by JA represented as the inter-individual neural synchronization. Enhanced synchronization in the right IFG may be the basis of the perception of the self in relation to others. This finding indicates that hyperscanning fMRI enables us to evaluate the neural dynamics of the social interaction as the pair of the brains, thus can open up the field of "we-mode" neuroscience.

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