Abstract
The study of sleep disorders is best done in a clinical sleep laboratory by polysomnography (PSG), which allows to record all physiological signals necessary to determine sleep macrostructure (sleep stages), sleep microstructure (arousal), as well as related behavior of cardio-respiratory parameters. PSG was extended by 125-channel-magnetoencephalography (MEG) running at the same time. A MEG laboratory consists of a magnetically shielded room (MSR) as MEG requires very low ambient magnetic fields in the range of pT and subjects slept for 3–4 h starting around midnight in the MEG laboratory. The PSG recordings were first analyzed manually to identify sleep stages. In a second step, common spectral properties of EEG and MEG were investigated using measures such as the time-frequency evolution across the scalp. Manual sleep staging served as input to the spectral analysis. Results show both combined and independent patterns in EEG and MEG demonstrating the potential of combined recordings in researching local brain activity during sleep.
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