POSTS (Positive occipital sharp transients of sleep)

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  • Located in the occipital regions bilaterally as positive waves, during drowsiness/sleep
  • Triangular in shape (like the capital lambda: Λ, only upside down) and generally symmetric.
  • Most evident in non-REM 1 and non-REM 2
  • Same morphology as Lambda waves, both in form and in occipital distribution, however lambda waves are during awake state, when visually fixating.
  • POSTS are completely normal, should not be confused with spikes

POSTS and vertexwaves in a young female adult in non REM 1 sleep.

POSTS en vertexwave (source) eegpedia1.png