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Vocal Tract Images Reveal Neural Representations of Sensorimotor Transformation During Speech Imitation
Imitating speech necessitates the transformation from sensory targets to vocal tract motor output, yet little is known about the representational basis of this process in the human brain. Here, we address this question by using real-time MR imaging (rtMRI) of the vocal tract and functional MRI (fMRI...
Autores principales: | , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Oxford University Press
2017
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5939209/ https://www.ncbi.nlm.nih.gov/pubmed/28334401 http://dx.doi.org/10.1093/cercor/bhx056 |
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author | Carey, Daniel Miquel, Marc E. Evans, Bronwen G. Adank, Patti McGettigan, Carolyn |
author_facet | Carey, Daniel Miquel, Marc E. Evans, Bronwen G. Adank, Patti McGettigan, Carolyn |
author_sort | Carey, Daniel |
collection | PubMed |
description | Imitating speech necessitates the transformation from sensory targets to vocal tract motor output, yet little is known about the representational basis of this process in the human brain. Here, we address this question by using real-time MR imaging (rtMRI) of the vocal tract and functional MRI (fMRI) of the brain in a speech imitation paradigm. Participants trained on imitating a native vowel and a similar nonnative vowel that required lip rounding. Later, participants imitated these vowels and an untrained vowel pair during separate fMRI and rtMRI runs. Univariate fMRI analyses revealed that regions including left inferior frontal gyrus were more active during sensorimotor transformation (ST) and production of nonnative vowels, compared with native vowels; further, ST for nonnative vowels activated somatomotor cortex bilaterally, compared with ST of native vowels. Using test representational similarity analysis (RSA) models constructed from participants’ vocal tract images and from stimulus formant distances, we found that RSA searchlight analyses of fMRI data showed either type of model could be represented in somatomotor, temporal, cerebellar, and hippocampal neural activation patterns during ST. We thus provide the first evidence of widespread and robust cortical and subcortical neural representation of vocal tract and/or formant parameters, during prearticulatory ST. |
format | Online Article Text |
id | pubmed-5939209 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2017 |
publisher | Oxford University Press |
record_format | MEDLINE/PubMed |
spelling | pubmed-59392092018-05-10 Vocal Tract Images Reveal Neural Representations of Sensorimotor Transformation During Speech Imitation Carey, Daniel Miquel, Marc E. Evans, Bronwen G. Adank, Patti McGettigan, Carolyn Cereb Cortex Original Articles Imitating speech necessitates the transformation from sensory targets to vocal tract motor output, yet little is known about the representational basis of this process in the human brain. Here, we address this question by using real-time MR imaging (rtMRI) of the vocal tract and functional MRI (fMRI) of the brain in a speech imitation paradigm. Participants trained on imitating a native vowel and a similar nonnative vowel that required lip rounding. Later, participants imitated these vowels and an untrained vowel pair during separate fMRI and rtMRI runs. Univariate fMRI analyses revealed that regions including left inferior frontal gyrus were more active during sensorimotor transformation (ST) and production of nonnative vowels, compared with native vowels; further, ST for nonnative vowels activated somatomotor cortex bilaterally, compared with ST of native vowels. Using test representational similarity analysis (RSA) models constructed from participants’ vocal tract images and from stimulus formant distances, we found that RSA searchlight analyses of fMRI data showed either type of model could be represented in somatomotor, temporal, cerebellar, and hippocampal neural activation patterns during ST. We thus provide the first evidence of widespread and robust cortical and subcortical neural representation of vocal tract and/or formant parameters, during prearticulatory ST. Oxford University Press 2017-05 2017-03-18 /pmc/articles/PMC5939209/ /pubmed/28334401 http://dx.doi.org/10.1093/cercor/bhx056 Text en © The Author 2017. Published by Oxford University Press. http://creativecommons.org/licenses/by/4.0/ This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited. |
spellingShingle | Original Articles Carey, Daniel Miquel, Marc E. Evans, Bronwen G. Adank, Patti McGettigan, Carolyn Vocal Tract Images Reveal Neural Representations of Sensorimotor Transformation During Speech Imitation |
title | Vocal Tract Images Reveal Neural Representations of Sensorimotor Transformation During Speech Imitation |
title_full | Vocal Tract Images Reveal Neural Representations of Sensorimotor Transformation During Speech Imitation |
title_fullStr | Vocal Tract Images Reveal Neural Representations of Sensorimotor Transformation During Speech Imitation |
title_full_unstemmed | Vocal Tract Images Reveal Neural Representations of Sensorimotor Transformation During Speech Imitation |
title_short | Vocal Tract Images Reveal Neural Representations of Sensorimotor Transformation During Speech Imitation |
title_sort | vocal tract images reveal neural representations of sensorimotor transformation during speech imitation |
topic | Original Articles |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5939209/ https://www.ncbi.nlm.nih.gov/pubmed/28334401 http://dx.doi.org/10.1093/cercor/bhx056 |
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