FEM median nerve tutorial
Dataset description
Experiment
The experiment consists of an unilateral median nerve stimulation conducted in a MEG laboratory with an Elekta Triux (Megin, Finland) scanner.
- 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 be able to average out time-locked noise to the stimulation, while remaining unnoticeable by 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 hand/wrist while current value was tuned to match the motor threshold of the subject on the stimulated hand, 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 MEG files underwent a MaxFilter (version 2.3.13) tsss post-processing.
MRI imaging scanning (Philips Medical Systems):
- T1w image without contrast: 3T field strength, flip angle 8°, TR 7.9s, dimensions 512 × 512 × 200, and voxel dimensions of 0.469 × 0.469 × 0.939 millimeters
- T2w spin-echo image: 3T field strength, 78.57% phase FOV, 90° flip angle, SAR 0.327, voxel dimensions 560 × 560 × 55, dimensions of 0.429 × 0.429 × 3 millimeters
- DWI sequences: voxel dimensions 512 x 512 x 200 and dimensions of 0.469 × 0.469 × 0.939 millimeters, diffusion-sensitizing gradients in 32 non-collinear directions
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)
License
Creative Commons CC0 1.0 Universal. This dataset is distributed in the public domain.