Interictal Epileptiform Discharges are Task Dependent and are Associated with Lasting Electrocorticographic Changes.

Autor: Meisenhelter S; Department of Neurology, Dartmouth-Hitchcock Medical Center, Lebanon, NH 03766, USA., Quon RJ; Department of Neurology, Geisel School of Medicine at Dartmouth College Hanover, NH 03755, United States., Steimel SA; Department of Neurology, Geisel School of Medicine at Dartmouth College Hanover, NH 03755, United States., Testorf ME; Thayer School of Engineering at Dartmouth College, Hanover, NH 03755, United States., Camp EJ; Department of Neurology, Dartmouth-Hitchcock Medical Center, Lebanon, NH 03766, USA., Moein P; Department of Neurology, Dartmouth-Hitchcock Medical Center, Lebanon, NH 03766, USA., Culler GW 4th; Department of Neurology, Dartmouth-Hitchcock Medical Center, Lebanon, NH 03766, USA., Gross RE; Department of Neurosurgery, Emory University, Atlanta, GA 30322, United States., Lega BC; Department of Neurosurgery, University of Texas-Southwestern, Dallas, TX 75390, United States., Sperling MR; Department of Neurology, Thomas Jefferson University, Philadelphia, PA 19144, United States., Kahana MJ; Department of Psychology, University of Pennsylvania, Philadelphia, PA 19104, United States., Jobst BC; Department of Neurology, Dartmouth-Hitchcock Medical Center, Lebanon, NH 03766, USA.
Jazyk: angličtina
Zdroj: Cerebral cortex communications [Cereb Cortex Commun] 2021 Mar 20; Vol. 2 (2), pp. tgab019. Date of Electronic Publication: 2021 Mar 20 (Print Publication: 2021).
DOI: 10.1093/texcom/tgab019
Abstrakt: The factors that control the occurrence of interictal epileptiform discharges (IEDs) are not well understood. We suspected that this phenomenon reflects an attention-dependent suppression of interictal epileptiform activity. We hypothesized that IEDs would occur less frequently when a subject viewed a task-relevant stimulus compared with viewing a blank screen. Furthermore, IEDs have been shown to impair memory when they occur in certain regions during the encoding or recall phases of a memory task. Although these discharges have a short duration, their impact on memory suggests that they have longer lasting electrophysiological effects. We found that IEDs were associated with an increase in low-frequency power and a change in the balance between low- and high-frequency oscillations for several seconds. We found that the occurrence of IEDs is modified by whether a subject is attending to a word displayed on screen or is observing a blank screen. In addition, we found that discharges in brain regions in every lobe impair memory. These findings elucidate the relationship between IEDs and memory impairment and reveal the task dependence of the occurrence of IEDs.
(© The Author(s) 2021. Published by Oxford University Press.)
Databáze: MEDLINE
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