Detecting phase coupling of sleep EEG via bispectra

Abstract

Bispectral analyses were utilized to study the rat electroencephalogram (EEG) to extract information regarding phase coupling. The results indicate that the EEG recorded from the hippocampus exhibits a strong phase coupling between frequencies in the theta band (6-8 Hz) primarily during REM sleep, while the cortical EEG exhibits a weak coupling between flow frequencies in the delta band (0-3 Hz) during quiet-waking. The degree of phase coupling was further quantified using the biocoherence function. This study provides data not available from traditional power-spectral analysis.<>