What are the EEG characteristics of the psychomotor epileptiform normal variant?

Updated: May 11, 2018
  • Author: Selim R Benbadis, MD; Chief Editor: Helmi L Lutsep, MD  more...
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A more useful and descriptive term for psychomotor variant is rhythmic midtemporal theta of drowsiness (RMTD). The frequency is theta (4-7 Hz). The location is maximum midtemporal, unilateral or bilaterally independent or bisynchronous. The morphology typically is notched, flat-topped, or sharply contoured (see the image below). Bursts may last 1-10 seconds or longer and thus resemble temporal lobe seizures. The amplitude is medium to high. [15, 16]

Rhythmic midtemporal theta of drowsiness (psychomo Rhythmic midtemporal theta of drowsiness (psychomotor variant). Note seizurelike rhythmicity and notched morphology.

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