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Generator sites of spontaneous MEG activity during sleep

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Abstract

We have recorded spontaneous magnetoencephalographic (MEG) activity during overnight natural sleep in 4 healthy adults with a 24-channel SQUID gradiometer, mainly over the sides of the head. All sleep stages were obtained. The MEG wave forms resembled the EEG phenomena recorded simultaneously from the scalp midline, but the electric and magnetic signals did not always coincide. The source locations of different signals were studied by using a current dipole model. The equivalent sources of magnetic transients, resembling and often coinciding with the electric vertex waves and K-complexes, as well as the transients during REM sleep, were concentrated within a volume of 4 × 4 × 3 cm2 in the inferior parietal lobe. For spindles and slow waves, no such focal generators were found.

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    This study was financially supported by the Academy of Finland, by the Körber Foundation (Hamburg, Germany), and by the Sigrid Jusélius Foundation.

    ∗∗

    We thank Mr. J. Karhu, Dr. Jyrki Mäkelä, Dr. L. Leinonen, Prof. O.V. Lounasmaa, and Ms. Ritva Paetau for comments on the manuscript.

    Present address: Tammiharju Hospital, 10600 Tammisaari, Finland.

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