Ongoing slow oscillatory phase modulates speech intelligibility in cooperation with motor cortical activity

Neural oscillation is attracting attention as an underlying mechanism for speech recognition. Speech intelligibility is enhanced by the synchronization of speech rhythms and slow neural oscillation, which is typically observed as human scalp electroencephalography (EEG). In addition to the effect of...

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Bibliographic Details
Published in:PloS one 2017-08, Vol.12 (8), p.e0183146-e0183146
Main Authors: Onojima, Takayuki, Kitajo, Keiichi, Mizuhara, Hiroaki
Format: Article
Language:English
Subjects:
Adult
Analysis
Biology and Life Sciences
Brain Mapping
Cortex (motor)
EEG
Electroencephalography
Engineering and Technology
Experiments
Female
Functional magnetic resonance imaging
Humans
Informatics
Intelligibility
Magnetic resonance
Magnetic Resonance Imaging
Male
Medicine and Health Sciences
Motor Cortex - anatomy & histology
Motor Cortex - physiology
Motor task performance
Neural oscillations
Neuroimaging
Noise
Research and Analysis Methods
Response time
Rhythm
Signal processing
Social Sciences
Speech
Speech Acoustics
Speech Intelligibility - physiology
Speech Perception - physiology
Speech recognition
Studies
Synchronization
Voice recognition
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Summary:Neural oscillation is attracting attention as an underlying mechanism for speech recognition. Speech intelligibility is enhanced by the synchronization of speech rhythms and slow neural oscillation, which is typically observed as human scalp electroencephalography (EEG). In addition to the effect of neural oscillation, it has been proposed that speech recognition is enhanced by the identification of a speaker's motor signals, which are used for speech production. To verify the relationship between the effect of neural oscillation and motor cortical activity, we measured scalp EEG, and simultaneous EEG and functional magnetic resonance imaging (fMRI) during a speech recognition task in which participants were required to recognize spoken words embedded in noise sound. We proposed an index to quantitatively evaluate the EEG phase effect on behavioral performance. The results showed that the delta and theta EEG phase before speech inputs modulated the participant's response time when conducting speech recognition tasks. The simultaneous EEG-fMRI experiment showed that slow EEG activity was correlated with motor cortical activity. These results suggested that the effect of the slow oscillatory phase was associated with the activity of the motor cortex during speech recognition.
ISSN:1932-6203
1932-6203
DOI:10.1371/journal.pone.0183146