Spontaneous variability predicts compensative motor response in vocal pitch control.

Autor: Tachibana RO; Center for Evolutionary Cognitive Sciences, The University of Tokyo, Tokyo, Japan. rtachi@gmail.com.; Department of Life Sciences, Graduate School of Arts and Sciences, The University of Tokyo, Tokyo, Japan. rtachi@gmail.com., Xu M; Global Research Institute, Keio University, Tokyo, Japan.; Department of Language Sciences, Graduate School of Humanities, Tokyo Metropolitan University, Tokyo, Japan., Hashimoto RI; Department of Language Sciences, Graduate School of Humanities, Tokyo Metropolitan University, Tokyo, Japan.; Research Center for Language, Brain and Genetics, Tokyo Metropolitan University, Tokyo, Japan., Homae F; Department of Language Sciences, Graduate School of Humanities, Tokyo Metropolitan University, Tokyo, Japan.; Research Center for Language, Brain and Genetics, Tokyo Metropolitan University, Tokyo, Japan., Okanoya K; Center for Evolutionary Cognitive Sciences, The University of Tokyo, Tokyo, Japan.; Department of Life Sciences, Graduate School of Arts and Sciences, The University of Tokyo, Tokyo, Japan.; RIKEN Center for Brain Science, Saitama, Japan.; Advanced Comprehensive Research Organization, Teikyo University, Tokyo, Japan.
Jazyk: angličtina
Zdroj: Scientific reports [Sci Rep] 2022 Oct 22; Vol. 12 (1), pp. 17740. Date of Electronic Publication: 2022 Oct 22.
DOI: 10.1038/s41598-022-22453-0
Abstrakt: Our motor system uses sensory feedback to keep desired performance. From this view, motor fluctuation is not simply 'noise' inevitably caused in the nervous system but would play a role in generating variations to explore better outcomes via sensory feedback. Vocalization system offers a good model for studying such sensory-motor interactions since we regulate vocalization by hearing our own voice. This behavior is typically observed as compensatory responses in vocalized pitch, or fundamental frequency (f o ), when artificial f o shifts were induced in the auditory feedback. However, the relationship between adaptive regulation and motor exploration in vocalization has remained unclear. Here we investigated behavioral variability in spontaneous vocal f o and compensatory responses against f o shifts in the feedback, and demonstrated that larger spontaneous fluctuation correlates with greater compensation in vocal f o . This correlation was found in slow components (≤ 5 Hz) of the spontaneous fluctuation but not in fast components (between 6 and 30 Hz), and the slow one was amplified during the compensatory responses. Furthermore, the compensatory ratio was reduced when large f o shifts were applied to the auditory feedback, as if reflecting the range of motor exploration. All these findings consistently suggest the functional role of motor variability in the exploration of better vocal outcomes.
(© 2022. The Author(s).)
Databáze: MEDLINE
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