Temporal patterns in human epileptic activity are modulated by perceptual discriminations

Neuroreport
M Le Van QuyenF J Varela

Abstract

We studied subdural recordings from a patient with an unusually focal and stable occipito-temporal epileptic discharge under four experimental conditions. The series of time intervals between successive spike discharges displayed a few (3-5) clusters of periodic values representing statistically significant short-term periodicities when tested against surrogate data. This short-term predictability was modulated during the different experimental conditions by periodicity shifts of the order of 15-30 ms. Correspondingly, there was an increased gamma-band (30-70 Hz) coherence between the epileptic focus and surrounding recording sites. We conclude that the focal epileptic activity is part of an extended network of neural activities which exert a fast modulation reflected in changes of transiently periodic activities.

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Citations

Jan 5, 2000·Human Brain Mapping·J P LachauxF J Varela
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Nov 25, 2014·Medicine, Health Care, and Philosophy·Elly Vintiadis

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