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Alpha Oscillations During Effortful Continuous Speech: From Scalp EEG to Ear-EEG
IEEE Transactions on Bio-Medical Engineering
|October 13, 2022
Summary
Alpha power measured by electroencephalography (EEG) can objectively track speech perception. This study shows alpha event-related synchronization (ERS) in both scalp and ear-EEG reflects listening effort and performance in noise.
Area of Science:
- Neuroscience
- Auditory Neuroscience
- Speech Perception
Background:
- Effortful listening in noisy environments is a significant challenge.
- Objective measures are needed to quantify listening effort.
- Electroencephalography (EEG) offers potential for such measures.
Purpose of the Study:
- To investigate alpha power using scalp and ear-EEG as an objective measure of listening effort in continuous speech.
- To explore the relationship between alpha activity and behavioral performance under varying noise conditions.
Main Methods:
- Simultaneous recording of scalp and ear-EEG during continuous speech presentation with varying signal-to-noise ratios (SNRs).
- Analysis of alpha event-related synchronization (ERS) and desynchronization (ERD) in response to changing SNRs.
- Correlation of alpha activity with behavioral performance on speech content comprehension questions.
Main Results:
- Alpha ERS decreased as SNR decreased, indicating increased listening effort with higher task demand.
- Alpha ERS in both scalp and ear-EEG showed a positive correlation with behavioral performance.
- Alpha ERS/ERD effectively tracked performance in continuous speech tasks.
Conclusions:
- Alpha ERS/ERD is a suitable metric for tracking continuous speech perception performance.
- EEG alpha power, measurable with both scalp and ear-EEG, can indicate speech perception accuracy.
- This approach offers an objective method to assess listening effort and performance.
