Phantom Spike and Wave

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Montage: unspecified


  • present in relaxed wakefulness, stage 1 sleep; tend to disappear in deeper sleep, which may be helpful in distinguishing them from epileptiform discharges which tend to persist or become more prominent with deeper levels of sleep)
  • diffuse, bisynchronous, relatively symmetric; predominate in anterior and posterior head regions
  • small diphasic spike with larger aftergoing slow wave
  • 1-2 second bursts
  • small diphasic spike, < 30 uV and < 30 msec
  • 50-100 uV slow wave

clinical significance

  • seen in adolescents and adults