The Effect of Coupled Electroencephalography Signals in Electrooculography Signals on Sleep Staging Based on Deep
Hangyu Zhu1, Cong Fu2, Feng Shu3
1School of Information Science and Technology, Fudan University, Shanghai 200433, China.
Bioengineering (Basel, Switzerland)
|May 27, 2023
Summary
Coupled electroencephalography (EEG) signals in electrooculography (EOG) improve automatic sleep staging accuracy. This study demonstrates that incorporating EEG data enhances EOG-based sleep analysis, providing a better experimental basis for sleep staging.
Area of Science:
- Neuroscience
- Biomedical Engineering
- Signal Processing
Background:
- Automatic sleep staging traditionally relies on electroencephalography (EEG) and electrooculography (EOG) signals.
- The potential influence of coupled electroencephalography (EEG) signals within electrooculography (EOG) on sleep staging accuracy has been largely overlooked.
- Proximity of EOG and prefrontal EEG sensors raises questions about signal coupling and its impact on EOG's intrinsic sleep staging capabilities.
Purpose of the Study:
- To investigate the effect of coupled electroencephalography (EEG) signals within electrooculography (EOG) on automatic sleep staging performance.
- To determine if incorporating EEG signal content into EOG improves sleep staging accuracy.
- To provide an experimental foundation for utilizing EOG signals with coupled EEG for enhanced sleep analysis.
Main Methods:
- Utilized blind source separation to isolate clean prefrontal EEG signals.
- Processed raw EOG and clean EEG signals to create EOG signals with varying degrees of EEG coupling.
- Employed a hierarchical neural network (convolutional neural network and recurrent neural network) for automatic sleep staging using the processed EOG signals.
- Validated the approach on two public and one clinical sleep dataset.
Main Results:
- Sleep staging using EOG signals with coupled EEG achieved accuracies of 80.4%, 81.1%, and 78.9% across the three datasets.
- These accuracies were slightly superior to those obtained using EOG signals without coupled EEG.
- The presence of an appropriate amount of coupled EEG signal in EOG demonstrably improved sleep staging outcomes.
Conclusions:
- The findings indicate that coupled EEG signals within EOG positively influence automatic sleep staging.
- An optimal level of EEG signal coupling in EOG enhances sleep staging performance.
- This research offers valuable experimental evidence supporting the use of EOG signals with inherent EEG coupling for improved sleep staging.
