FEM median nerve tutorial
Dataset description
License [TODO]
This tutorial dataset (MEG/EEG and MRI data) openly shared with the community for its value as an example dataset. Its use and transfer outside the Brainstorm tutorial, e.g. for research purposes, is allowed.
Experiment
The experiment consists of an unilateral median nerve stimulation conducted in a MEG laboratory with an Elekta Triux (Megin, Finland) scanner. The dataset consists of one single subject.
- The stimulation signal was a square-wave pulse with 2Hz frequency and duration of 0.2ms.
- An ISI (inter-stimulus interval) of 500ms with a variation of ±20ms in order to average out time-locked noise to the stimulation, while remaining unnoticeable to the subject.
- The stimulation was performed on the left hand/wrist, for two minutes, with a Digitimer DS7A stimulator. An electrode was placed on the left wrist and the current value was tuned to match the motor threshold of the subject, with a result of 10~12mA approximately.
- Recordings were performed with a 1kHz sampling rate. Continuous HPI was disabled during these recordings. High-pass filters were set to DC for MEG channels and 0.03Hz for EEG channels.
All files underwent a MaxFilter (version 2.3.13) tsss post-processing.
Files
The dataset we distribute with this tutorial follows the Brain Imaging Data Structure (BIDS) standard for neuroimaging data organization. The files that will be imported in this tutorial are the following:
sample_fem/sub-fem01/: Raw data for subject fem01
ses-meg/: Simultaneous recordings of MEG and EEG.
sub-fem01_ses-meg_task-mediannerve_run-01_proc-tsss_meg.fif
ses-mri/: Imaging exams.
anat/sub-fem01_ses-mri_T1w.nii.gz: T1-weighted MRI
anat/sub-fem01_ses-mri_T2w.nii.gz: T2-weighted MRI
dwi/sub-fem01_ses-mri_dwi.*: Diffusion-Weighted Imaging (DWI)