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Sleep Spindles in Magnetoencephalography and Electroencephalography

  • Nobukazu Nakasato
  • Keisaku Hatanaka
  • Kaoru Seki
  • Takashi Yoshimoto
  • Hisashi Kado

Abstract

Sleep spindles are one of the characteristic EEG transients of sleep. They are found at a frequency range of 12.5–16.0 Hz and primarily at the vertex. This important pattern, however, is poorly understood neurophysiologically and its origin remains controversial. A previous neuromagnetic study (Hughes et al., 1976) indicated there are few sleep spindles in MEG recordings, however, we observed many MEG spindles above the central vertex (Nakasato et al., 1988). We also indicated that sleep spindles were under three distinct conditions: (i) when they were detected simultaneously in MEG and EEG, (ii) when they were detected alone in MEG without comparable EEG activity, (iii) when they were detected alone in EEG without comparable MEG activity. In this study, we measured the MEG at larger number of point over the scalp to show the spatial distribution of sleep spindles in MEG.

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References

  1. Caderas, M., Niedermeyer, E., Uematsu, S., Long, D.M., and Nastalski, J., 1982, Sleep spindles recorded from deep cerebral structures in man. Clin. Electroenceph., 13:216.Google Scholar
  2. Cooper, R., Winter, A.L., Crow, H.J. and Walter, W.G., 1965, Comparison of subcortical, cortical and scalp activity using chronically indwelling electrodes in man. Electroenceph. Clin. Neurophysiol., 18:217.PubMedCrossRefGoogle Scholar
  3. Hughes, J.R., Hendrix, D.E., Cohen, J., Duffy, F.H., Mayman, C.I., Scholl, M.L., and Cuffin, B.N., 1976, Relationship of the magnetoencephalogram to the electroencephalogram. Normal wake and sleep activity. Electroenceph. Clin. Neurophysiol., 40:261.PubMedCrossRefGoogle Scholar
  4. Nakasato, N., Kado, H., Nakanishi, M., Koyanagi, M., Kasai,N., Niizuma, H., Yoshimoto, T., and Suzuki, J., 1988, Magnetic detection of sleep spindles in normal subjects. The 3rd Congress of Japan Biomagnetism and Bioelectromagnetics Society, June 3–4, Tokyo.Google Scholar
  5. Okada, Y.,1983, Neurogenesis of evoked magnetic field, in: “Proc. NATO advanced study institute on biomagnetism,” Plenum, New York, pp399–408.Google Scholar

Copyright information

© Plenum Press, New York 1989

Authors and Affiliations

  • Nobukazu Nakasato
    • 1
  • Keisaku Hatanaka
    • 2
  • Kaoru Seki
    • 1
  • Takashi Yoshimoto
    • 1
  • Hisashi Kado
    • 3
  1. 1.Division of NeurosurgeryInstitute of Brain Diseases, Tohoku University School of MedicineSendaiJapan
  2. 2.ULVAC Japan, Ltd.Hagisono, ChigasakiJapan
  3. 3.Electrotechnical LaboratoryTsukubaJapan

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