What are the variances in normal alpha rhythm on EEG?

Updated: Oct 09, 2019
  • Author: Selim R Benbadis, MD; Chief Editor: Helmi L Lutsep, MD  more...
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Occasionally the alpha rhythm is of very low amplitude or even not identifiable. This is not abnormal. In addition to amplitude, other characteristics can vary somewhat without being abnormal, including morphology (eg, spiky), distribution (eg, widespread), and harmonic frequency (eg, slow or fast alpha variant).

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