2014年4月3日木曜日

Attributing awareness to oneself and to others

Yin T. Kelly, Taylor W. Webb, Jeffrey D. Meier, Michael J. Arcaro, and Michael S. A. Graziano
Proceedings of the National Academy of Sciences 1 April 2014; Vol. 111, No. 13

「他者がある物体を(視覚的に)認識しているか?」を判断する際にはTPJ(側頭頭頂接合部)が活動する。
一方、TMSを用いてTPJの活動を人為的に抑制すると、(被験者自身の)物体の認識がうまくできなくなる。
→「他者の物体認識についての判断」と「自分自身の(視覚的)物体認識」は同じ脳領域で行われている。

This study tested the possible relationship between reported visual awareness (“I see a visual stimulus in front of me”) and the social attribution of awareness to someone else (“That person is aware of an object next to him”). Subjects were tested in two steps. First, in an fMRI experiment, subjects were asked to attribute states of awareness to a cartoon face. Activity associated with this task was found bilaterally within the temporoparietal junction (TPJ) among other areas. Second, the TPJ was transiently disrupted using single-pulse transcranial magnetic stimulation (TMS). When the TMS was targeted to the same cortical sites that had become active during the social attribution task, the subjects showed symptoms of visual neglect in that their detection of visual stimuli was significantly affected. In control trials, when TMS was targeted to nearby cortical sites that had not become active during the social attribution task, no significant effect on visual detection was found. These results suggest that there may be at least some partial overlap in brain mechanisms that participate in the social attribution of sensory awareness to other people and in attributing sensory awareness to oneself.

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