#bioelectricity  electric phenomena in animals or plants
  supertype:  organic_phenomenon__organicphenomenon  a natural phenomenon involving living plants and animals
  subtype:  brainwave__brain_wave__brainwave__cortical_potential  (neurophysiology) rapid fluctuations of voltage between parts of the cerebral cortex that are detectable with an electroencephalograph
     subtype:  alpha_rhythm__alpharhythm__alpha_wave__alphawave  the normal brainwave in the electroencephalogram of a person who is awake but relaxed; occurs with a frequency of 8-12 hertz
     subtype:  beta_rhythm__beta_wave  the normal brainwave in the encephalogram of a person who is awake and alert; occurs with a frequency between 12 and 30 hertz
     subtype:  delta_rhythm__deltarhythm__delta_wave__deltawave  the normal brainwave in the encephalogram of a person in deep dreamless sleep; occurs with high voltage and low frequency (1 to 4 hertz)
     subtype:  theta_rhythm__thetarhythm__theta_wave__thetawave  the normal brainwave in the encephalogram of a person who is awake but relaxed and drowsy; occurs with low frequency and low amplitude

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