Brain Topography

, Volume 15, Issue 1, pp 43–49

Scalp Topography of the Spontaneous K-Complex and of Delta-Waves in Human Sleep

Authors

  • Svenja Happe
    • Department of Neurology,University of Vienna,
    • Department of Clinical Neurophysiology,University of Goettingen,
  • Peter Anderer
    • Department of Psychiatry,University of Vienna,
  • Georg Gruber
    • Department of Psychiatry,University of Vienna,
  • Gerhard Klösch
    • Department of Neurology,University of Vienna,
  • Bernd Saletu
    • Department of Psychiatry,University of Vienna,
  • Josef Zeitlhofer
    • Department of Neurology,University of Vienna,
Article

DOI: 10.1023/A:1019992523246

Cite this article as:
Happe, S., Anderer, P., Gruber, G. et al. Brain Topogr (2002) 15: 43. doi:10.1023/A:1019992523246

Abstract

Objective: Together with spindles, K-complexes are well known hallmarks of stage 2 sleep (S2). However, little is known about their topographical distribution in comparison to delta-waves and to K-complexes superimposed by spindles. Patients and methods: In this study, the topographical distribution of spontaneous K-complexes and delta-waves in S2 and delta-waves in stage 4 sleep (S4) in 10 healthy young adults (aged 20 to 35 years, 7 female) was investigated. K-complexes with and without spindles in S2, delta-waves with and without spindles in S2, and delta-waves in S4 distributed all over the night were visually selected. EEG power maps and statistical parametric maps were calculated. Results: Absolute delta power of S2 K-complexes appeared to be significantly higher than of S2 delta-waves and delta power of S4 delta-waves was higher than of S2 delta-waves. In K-complexes and delta-waves, power was found to be highest over medio-frontal regions in the delta frequency band (0.5 - 4.0 Hz) with a second maximum occipitally in delta-waves, no matter whether superimposed by a spindle or not. Conclusion: K-complexes and delta-waves in S2 differ in topographical distribution. Even though in S2 delta-waves have less power, they have a similar topographical distribution in S2 and S4, supporting the hypothesis that delta-waves in S2 further develop towards delta-waves in slow wave sleep. The delta frequency components of K-complexes and delta-waves are unaffected by spindles.

K-complexDelta-waveSleep spindleStage 2 sleepStage 4 sleepTopography

Copyright information

© Human Sciences Press, Inc. 2002