What are Glossokinetic artifacts on EEG?

Updated: Oct 09, 2019
  • Author: Selim R Benbadis, MD; Chief Editor: Helmi L Lutsep, MD  more...
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Answer

Answer

In addition to muscle activity, the tongue (like the eyeball) functions as a dipole, with the tip negative with respect to the base. In this case, the tip of the tongue is the most important part because it is more mobile. The artifact produced by the tongue has a broad potential field that drops from frontal to occipital areas, although it is less steep than that produced by eye movement artifacts. The amplitude of the potentials is greater inferiorly than in parasagittal regions; the frequency is variable but usually in the delta range and occurs synchronously when the patient says "Lah-lah-lah-lah" or "Lilt-lilt-lilt-lilt," which can be verified by the technologist. Chewing and sucking can produce similar artifacts. These are commonly observed in young patients. However, they also can be observed in patients with dementia or those who are uncooperative.


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