事象関連電位による視聴覚音声知覚の検討 : N1成分とP2成分による言語間比較

概要

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By using event-related potentials (ERP, Experiment 2) and reaction times (RT, Experiment 1), the present study examined interlanguage differences between Japanese and English in audio-visual speech perception (Kuhl, Tsuzaki, Tohkura, & Meltzoff, 1994; Sekiyama & Burnham, 2008; Sekiyama & Tohkura, 1991, 1993). There were an auditory-only (AO) and a congruent auditory-visual (AV) conditions. In Experiment 1, RTs showed opposite tendencies between English-language (EG) and Japanese-language(JG) groups for the AO-AV relationship: the additional congruent visual information speeded up the speech perception processes for the EG, but it slowed down the processes for the JG. Thus, the visual influence was promoting for the EG but disturbing for the JG. In Experiment 2, different ERP patterns were found between the EG and JG: Whereas the visual influence was sustained (maintained from N1 to P2) in the EG, the influence was transient (limited only to N1) in the JG. The ERP and RT data were both consistent with the reported interlanguage differences that the JG perceivers use visual information to the less extent than the EG perceivers do.
2010-03-25