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      Studies of the coefficient of variation of the magnitude of EEG signals

      Round, W. Howell; Sleigh, James W.
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      studies of the coefficient of variation.pdf
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      Round, H. & Sleigh, J. W. (2001). Studies of the coefficient of variation of the magnitude of EEG signals. In Proceedings of the 23rd Annual International Conference of the IEEE. Washington, DC, USA: IEEE.
      Permanent Research Commons link: https://hdl.handle.net/10289/3239
      Abstract
      An analysis of the variation in magnitude of EEG signals in various frequency bands of anesthetized patients and normal sleeping volunteers was carried out. The coefficient of variation (CoV), i.e. the standard deviation/mean, within 10 second epochs was found to be quite constant throughout the whole of the EEG recordings and was typically about 0.46. This was found to be the case for both the patients and the volunteers. Histograms of the magnitudes indicated that the magnitudes are distributed as f(x)=βxe(-αx2) functions. However a CoV of 0.46 is consistent with f(x)=βxe(-αx3) functions. The non-stationary nature of the EEG is such that it is likely that while over short periods the EEG magnitudes are distributed as f(x)=βxe(-αx3) functions, variations of α over time mean that in the long term the EEG magnitudes are distributed as f(x)=βxe(-αx2) functions.
      Date
      2001
      Type
      Conference Contribution
      Publisher
      IEEE
      Rights
      ©2001 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.
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