Increased delta power as a scalp marker of epileptic activity: a simultaneous scalp and intracranial electroencephalography study.

ABSTRACT:

Background and purpose

The purpose was to evaluate whether intracranial interictal epileptiform discharges (IEDs) that are not visible on the scalp are associated with changes in the frequency spectrum on scalp electroencephalograms (EEGs).

Methods

Simultaneous scalp high-density EEG and intracranial EEG recordings were recorded in nine patients undergoing pre-surgical invasive recordings for pharmaco-resistant temporal lobe epilepsy. Epochs with hippocampal IED visible on intracranial EEG (ic-IED) but not on scalp EEG were selected, as well as control epochs without ic-IED. Welch's power spectral density was computed for each scalp electrode and for each subject; the power spectral density was further averaged across the canonical frequency bands and compared between the tw

SUBMITTER: De Stefano P 

PROVIDER: S-EPMC9293335 | biostudies-literature | 2022 Jan

REPOSITORIES: biostudies-literature