Sustained neural rhythms reveal endogenous oscillations supporting speech perception

van Bree, Sander and Sohoglu, Ediz and Davis, Matthew H. and Zoefel, Benedikt and Pack, Christopher (2021) Sustained neural rhythms reveal endogenous oscillations supporting speech perception. PLOS Biology, 19 (2). e3001142. ISSN 1545-7885

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Abstract

Rhythmic sensory or electrical stimulation will produce rhythmic brain responses. These rhythmic responses are often interpreted as endogenous neural oscillations aligned (or “entrained”) to the stimulus rhythm. However, stimulus-aligned brain responses can also be explained as a sequence of evoked responses, which only appear regular due to the rhythmicity of the stimulus, without necessarily involving underlying neural oscillations. To distinguish evoked responses from true oscillatory activity, we tested whether rhythmic stimulation produces oscillatory responses which continue after the end of the stimulus. Such sustained effects provide evidence for true involvement of neural oscillations. In Experiment 1, we found that rhythmic intelligible, but not unintelligible speech produces oscillatory responses in magnetoencephalography (MEG) which outlast the stimulus at parietal sensors. In Experiment 2, we found that transcranial alternating current stimulation (tACS) leads to rhythmic fluctuations in speech perception outcomes after the end of electrical stimulation. We further report that the phase relation between electroencephalography (EEG) responses and rhythmic intelligible speech can predict the tACS phase that leads to most accurate speech perception. Together, we provide fundamental results for several lines of research—including neural entrainment and tACS—and reveal endogenous neural oscillations as a key underlying principle for speech perception.

Item Type: Article
Subjects: Oalibrary Press > Biological Science
Depositing User: Managing Editor
Date Deposited: 21 Mar 2023 05:48
Last Modified: 14 Mar 2024 04:28
URI: http://asian.go4publish.com/id/eprint/796

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