EEG and epilepsy

This tutorial introduces some concepts that are specific to the management of EEG recordings in the Brainstorm environment. It also describes a standard pipeline for analyzing epilepsy recordings. It is based on clinical case from the Epilepsy Centre, at the University Hospital Freiburg, Germany. The EEG data was recorded at 1024Hz, using a Neurofile NT digital video-EEG system with 128 channels. The anonymized dataset can be downloaded directly from the download page (sample_epilepsy.zip).

The case from the tutorial is also published in this article:
Dümpelmann M, Ball T, Schulze-Bonhage A, LORETA allows reliable distributed source reconstruction based on subdural strip and grid recordings, Hum Brain Mapp. 2012

Presentation of the clinical case

The signal was filtered in the recording system with a high-pass filter with a time constant of 1 second and a low-pass filter with a cutoff frequency of 344 Hz. The spikes were visually identified and averaged with the ASA package. The spike average showed prominent peaks in the grid contacts G_A2-4, G_B2-5, G_C1-3.

recordings