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開催日 2014/9/13
時間 11:00 - 12:00
会場 Poster / Exhibition(Event Hall B)

Voice adjustments in response to unrecognized changes in modified auditory feedback

  • P3-251
  • 徐 鳴鏑 / Mingdi Xu:1 橘 亮輔 / Ryosuke O. Tachibana:2,3 保前 文高 / Fumitaka Homae:1 橋本 龍一郎 / RYu-ichiro Hashimoto:1 岡ノ谷 一夫 / Kazuo Okanoya:3 萩原 裕子 / Hiroko Hagiwara:1 
  • 1:首都大学東京大学院人文科学研究科言語科学教室 / Department of Language Sciences, Graduate School of Humanities, Tokyo Metropolitan University, Tokyo, Japan 2:独立行政法人日本学術振興会 / Japan Society for the Promotion of Science 3:東京大学大学院総合文化研究科教養学部 / Graduate School of Arts and Sciences, The University of Tokyo, Tokyo, Japan 

Auditory feedback (AF), the vocal signals received by the speaker's own auditory system during speech production, plays a vital role in the control of phonation and articulation. It is presumed to help to monitor whether the current utterance is in accord with the speaker's intention. Previous studies have provided evidence that when perturbations are introduced to certain acoustic features of AF, such as fundamental frequency (F0, the perceived pitch), loudness, and formant frequencies, speakers often show compensatory responses, i.e., online articulatory correction in directions opposite to the perturbations. The present study was designed to investigate whether speakers compensate for acoustic perturbations that they are not able to explicitly perceive. Forty native Japanese speakers received two types of modified AF (F0 shift or formant structure manipulation) during sustained vowel articulation. The modifications in F0 (±25, 50 and 100 cents) and formant structure (by contracting or extending the vocal spectrum envelope by 3, 6 and 12 percent) were applied independently. Compensatory responses for F0 were observed in the F0-shifted conditions but not in the formant structure-manipulated conditions even though most of the participants misidentified formant frequency alterations as pitch changes. Furthermore, such F0 compensation showed almost linear relationship with the F0 shifts. Most importantly, compensation was observed even when the F0 shift was very slight (±25 cents) and the participants could not reliably perceive the pitch changes. These results indicate that the self-regulation system of speech production may have an implicit component, which might be founded on an auditory-motor pathway in the cortical language network.

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