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Ambiguous paroxysmal events: rhythmic movements

Artifact caused by rhythmic movement can be difficult to distinguish from cortical pattern. Psychogenic nonepileptic seizures typically have less variability in frequency within a narrow range of duration. It has been shown that time-frequency analysis of data of the movements could be utilized as a diagnostic tool to differentiate between epileptic and nonepileptic convulsive seizure-like events. (Contributed by Dr. Selim R Benbadis.)