Hi there,
Apologies if the answer to this question is obvious or exists elsewhere; this does follow a careful read of the tutorial and other online sources!
Essentially, I wish to perform source reconstruction on my EEG data. I collected the data using a 64-channel ANT Neuro Waveguard cap. I also plan to obtain a structural MRI scan for my participant. I'm a little confused about what the best way to proceed is from there. As far as I can tell:
I use FreeSurfer for MRI segmentation and import the FreeSurfer folder into Brainstorm
I set the fiducials on the MRI volume that I imported
I compute the BEM forward model, having installed FieldTrip on my computer.
Switching to the functional data view, I select 'Compute head model' and select 'OpenMEEG BEM'
I compute the noise covariance matrix
Really, the final step is the one I'm most confused by (and perhaps the most simple!). Does Brainstorm keep a record of the standard ANT Neuro Waveguard cap 64 electrode positions? If so, are these positions then automatically 'registered' to the participant's individual MRI, after which source reconstruction can occur? Again, apologies if this was a very simple question. I'm very happy to go over anything again if unclear
When you set the fiducials, brainstorm can compute a transformation from your MRI volume space to a common space (like MNI). the Waveguard cap 64 electrode positions are saved in these coordinates to be approximately mapped back to your MRI. It is always good to check the mapped locations and project them on the scalp.
Hi @samwray, if you are new in Brainstorm, we recommend you start by following the introduction tutorials first (section "Get started" on the tutorial page), using the example dataset that is provided. By doing so, you will get familiar with Brainstorm features, processes and jargon.
[https://neuroimage.usc.edu/brainstorm/Tutorials
About the BEM forward model, there is no need for you to install FieldTrip, Brainstorm can handle it as a plugin, making it transparent to you.
For the noise covariance matrix, as you are working with EEG, there is no possible to record an empty room noise, but there are other approaches, check this link:
