I have obtained 4 single signal matrices from a matlab script. I saved those matrices in .mat format. i then loaded them in braisntorm to do source localisation. when in loaded the matrices, brainstorm created a channel file with a single electrode. this seems logical since each matrix is a single time series. A matrix represents a mean of signals and not a single electrode. I then calculate the head model and brainstorm gives me this error message:
If you want to estimate any relation between the anatomy and the sensors, you need to know the respective positions of the two.
What is missing in your channel file (and the reason for which you are getting this error) is that the electrode does not have a 3D position defined. You need to place this electrode on the subject’s head (import this position or set it with the popup menu MRI registration > Edit).
Note that with one channel only the results you will get with the source estimation will not be very interesting. You’ll get higher values close to the electrode, that’s it.
If the different files you show on the screen captures are different electrodes, they should be all saved in the same file, and your channel file should have four entries.
The new version of the Brainstorm tutorials on which we are currently working explain better the meaning of the different data structures, try to read from #1 to #5: http://neuroimage.usc.edu/brainstorm/TutorialsNew
