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Neural speech tracking shifts from the syllabic to the modulation rate of speech as intelligibility decreases

View ORCID ProfileFabian Schmidt, View ORCID ProfileYa-Ping Chen, View ORCID ProfileAnne Keitel, View ORCID ProfileSebastian Rösch, Ronny Hannemann, Maja Serman, View ORCID ProfileAnne Hauswald, View ORCID ProfileNathan Weisz
doi: https://doi.org/10.1101/2021.03.25.437033
Fabian Schmidt
1Centre for Cognitive Neuroscience, University of Salzburg, 5020 Salzburg, Austria
2Department of Psychology, University of Salzburg, 5020 Salzburg, Austria
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  • For correspondence: Fabian.Schmidt@sbg.ac.at
Ya-Ping Chen
1Centre for Cognitive Neuroscience, University of Salzburg, 5020 Salzburg, Austria
2Department of Psychology, University of Salzburg, 5020 Salzburg, Austria
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Anne Keitel
3Psychology, School of Social Sciences, University of Dundee, DD1 4HN Dundee, UK
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Sebastian Rösch
4Department of Otorhinolaryngology, Paracelsus Medical University, 5020 Salzburg, Austria
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Ronny Hannemann
5Audiological Research Unit, Sivantos GmbH, 91058 Erlangen, Germany
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Maja Serman
5Audiological Research Unit, Sivantos GmbH, 91058 Erlangen, Germany
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Anne Hauswald
1Centre for Cognitive Neuroscience, University of Salzburg, 5020 Salzburg, Austria
2Department of Psychology, University of Salzburg, 5020 Salzburg, Austria
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Nathan Weisz
1Centre for Cognitive Neuroscience, University of Salzburg, 5020 Salzburg, Austria
2Department of Psychology, University of Salzburg, 5020 Salzburg, Austria
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ABSTRACT

The most prominent acoustic features in speech are intensity modulations, represented by the amplitude envelope of speech. Synchronization of neural activity with these modulations is vital for speech comprehension. As the acoustic modulation of speech is related to the production of syllables, investigations of neural speech tracking rarely distinguish between lower-level acoustic (envelope modulation) and higher-level linguistic (syllable rate) information. Here we manipulated speech intelligibility using noise-vocoded speech and investigated the spectral dynamics of neural speech processing, across two studies at cortical and subcortical levels of the auditory hierarchy, using magnetoencephalography. Overall, cortical regions mostly track the syllable rate, whereas subcortical regions track the acoustic envelope. Furthermore, with less intelligible speech, tracking of the modulation rate becomes more dominant. Our study highlights the importance of distinguishing between envelope modulation and syllable rate and provides novel possibilities to better understand differences between auditory processing and speech/language processing disorders.

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Competing Interest Statement

The authors have declared no competing interest.

Copyright 
The copyright holder for this preprint is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under a CC-BY-NC-ND 4.0 International license.
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Posted March 26, 2021.
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Neural speech tracking shifts from the syllabic to the modulation rate of speech as intelligibility decreases
Fabian Schmidt, Ya-Ping Chen, Anne Keitel, Sebastian Rösch, Ronny Hannemann, Maja Serman, Anne Hauswald, Nathan Weisz
bioRxiv 2021.03.25.437033; doi: https://doi.org/10.1101/2021.03.25.437033
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Neural speech tracking shifts from the syllabic to the modulation rate of speech as intelligibility decreases
Fabian Schmidt, Ya-Ping Chen, Anne Keitel, Sebastian Rösch, Ronny Hannemann, Maja Serman, Anne Hauswald, Nathan Weisz
bioRxiv 2021.03.25.437033; doi: https://doi.org/10.1101/2021.03.25.437033

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