= 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 Brainstorm download page.

The case from this tutorial is also published in this article: Dümpelmann M, Ball T, Schulze-Bonhage A<<BR>>[[http://www.ncbi.nlm.nih.gov/pubmed/21618659|LORETA allows reliable distributed source reconstruction based on subdural strip and grid recordings]], Hum Brain Mapp. 2012

== License ==
This tutorial dataset (EEG and MRI data) remains proprietary of the Epilepsy Centre, University Hospital Freiburg, Germany. Its use and transfer outside the Brainstorm tutorial, e.g. for research purposes, is prohibited without written consent from the Epilepsy Centre in Freiburg. For questions please contact A. Schulze-Bonhage, MD, PhD: andreas.schulze-bonhage@uniklinik-freiburg.de

== Presentation of the clinical case ==
The EEG data was recorded at 1024Hz, using a Neurofile NT digital video-EEG  system with 128 channels and a 16-bit A/D converter. 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.

Type of epilepsy, supposed location, clinical conclusions, etc.

== Download and installation ==
 * Requirements: You have  already followed all the introduction tutorials and you have a working copy of  Brainstorm installed on your computer.
 * Go to the [[http://neuroimage.usc.edu/brainstorm3_register/download.php|Download]] page of this website, and dowload the file: '''sample_epilepsy.zip '''
 * Unzip   it in a folder that is __not__ in any of the Brainstorm folders (program   folder or database folder)
 * Start Brainstorm (Matlab scripts or stand-alone version)
 * Select the menu File > Create new protocol. Name it "'''!TutorialEpilepsy'''" and select the options:
  * "'''No, use individual anatomy'''",
  * "'''Yes, use one channel file per subject'''".

== Import the anatomy ==
 * Create one subject.
 * Right-click on the subject node > Import anatomy folder > sample_epilepsy/Anatomy (format=BrainVISA)
 * For now the MRI is processed with BrainVISA, but we would like to have it fully processed with !FreeSurfer.
 * If no anatomy available: [[Tutorials/TutWarping|Warping tutorial]]

== Access the recordings ==
 * Switch to the "functional data" view.
 * Right-click on the subject folder > Review raw file > sample_epilepsy/Data/tutorial_EEG.bin (format = "EEG: Deltamet Neurofile-Coherence (*.bin)")
 * Right-click on the subject folder > Import channel file > sample_epilepsy/Data/XensorTest.elc (format = "EEG: ANT Xensor (*.elc)")<<BR>=> Contains the default electrodes positions from the ASA software (ANT).
 * Change the sensor type of the following electrodes to '''MISC''': SP1, SP2, RS, PHO, DELR,     DELL, QR, QL
 * Run the automatic alignment manually.

== Mark and review spikes ==
 * How was it done initially?
 * How would we do it in Brainstorm?
 * Import 177 spikes:
  * '''[-1, +1] seconds''' around the spike events (???)
  * Remove DC offset based on the whole trial (-1s to +1s) (???)

== Source analysis ==
 * Compute head model: OpenMEEG or 3-shell sphere (???)
 * Noise covariance matrix: '''[-1000, -800] ms''' from all the imported trials (???)
 * Source model: (???)

== Moving dipoles ==
Illustrate John/Beth's tools for calculating and displaying dipoles.

== Tools to be developed for this tutorial ==
 * Set the time resolution of the display figures in seconds per centimeter (s/cm): the length of the page changes automatically with the size of the window.
 * Flip +/- the Y axis (already done: check the brainstorm toolbar)
 * Refine a bit the display of the dipoles
 * Flexible montage interface (is this useful here ???)

{{attachment:SL_MNE_tutorial_patient.jpg||height="403",width="645"}}