What is the morphology of EEG lambda waves?

Updated: Oct 09, 2019
  • Author: Roy Sucholeiki, MD; Chief Editor: Selim R Benbadis, MD  more...
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Example of either lambda or positive occipital sha Example of either lambda or positive occipital sharp transients of sleep (POSTS).

See the list below:

  • Lambda waves occur in the occipital regions bilaterally as positive (upgoing) waves.

  • They are triangular in shape and generally symmetric.

  • They occur in the awake patient and are said to be most evident when the subject stares at a blank, uniform surface.

  • Lambda waves occur when reading and occasionally when watching TV.

  • Morphologically, they are similar to POSTS both in form and in occipital distribution.

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