Division of Behavioral and Neural Biology Hokkaido University

Division of Behavioral and Neural Biology
Hokkaido University
Seminar
土谷尚嗣 Naotsugu Tsuchiya
モナシュ大学 Monash University
統合情報の構造は意識の中身を反映する
Structure of Integrated Information
Reflects Contents of Consciousness
The Integrated information theory (IIT) aims to explain how our conscious
experience is supported by the mechanisms in the brain. The IIT predicts that
a pattern of integrated information generated by some parts of the brain
corresponds to the contents of consciousness. Here, we set out to test the
prediction by measuring a pattern of the integrated information, or phi*,
based on field potentials recorded with electrodes in awake epilepsy patients,
who performed several visual psychophysical tasks. We found a structure of
phi*, constructed from the face selective areas in the temporal lobe, without
any supervised learning, classified subjective visual experience of faces,
rather than properties of physical visual input of faces. We ruled out a
possibility that high dimensionality of the phi*-pattern was sufficient for such
categorization by analysing high-dimensional pattern derived by other
quantities as well as phi* structure derived from other areas that are not
selective to faces: both poorly reflected subjective experience compared to
phi* structure derived from the face selective areas. In sum, without any
training or decoding, high-dimensional phi* structure naturally mirrored
subjective experience of faces, promising the IIT as a possible solution to the
enigma of consciousness.
（世話人より）土谷先生は「意識」を神経科学の問題として捉え，それを
Integrated Information Theory を使って解き明かそうとしています。Cristof
Koch の著書「意識の探求」や「意識をめぐる冒険」の翻訳者としても知ら
れている気鋭の研究者です。今回ルスツで行われる「脳と心のメカニズム冬
のワークショップ」のトピックスピーカーとして来札されるのを機に，講演
をお願いしました。学生，教員の方の多くの来聴をお待ちしています。
２０１５年１月６日（火）１７：００１８：３０理学部５号館（高層棟）８１３号室世話人：小川宏人（内線 3525，[email protected]）

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