NONLINEAR STATE-SPACE PROJECTION BASED METHOD TO ACQUIRE EEG AND ECG COMPONENTS USING A SINGLE ELECTRODE

Abstract

In some diagnoses, such as the polysomnography, simultaneous measurement of the electroencephalogram (EEG) and the electrocardiogram (ECG) is often required. It would be more efficient if both the EEG and ECG could be obtained simultaneously by using a single measurement. In this paper, we introduce a nonlinear state-space projection-based technique to extract the EEG and ECG components from an EEG signal measured with a non-cephalic reference (NCR) that guarantees accurate detection of R waves in the EEG measurement. Evaluation of the method using simulated data showed that the improved normalized power spectrum in alpha, beta (13-30 Hz), and theta bands were accurate. In an accrual EEG, measured using the NCR electrode, it was confirmed that the frequency components of the extracted EEG were accurate, and no spikes that could be attributed to the ECG component were observed in the resultant EEG signal.