Hi, Francois
When I export the pre-processed MEG data, I choose to export to mat format, because I want to try interpolation with the mat file, but Matlab reports an error as shown in the following figure. How can I solve it?
Indeed, MEG signals can't be exported to SPM file format.
If you want an access to the values of the MEG signals in Matlab, you don't need to "export" the files. You can read the data files directly from the database.
See this tutorial: https://neuroimage.usc.edu/brainstorm/Tutorials/Scripting
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