I have a question about the type of files I should use to project sources to default anatomy.
In order to perform group analysis, the approach in the tutorial is to project the individual source file to a default anatomy. My understanding is that after I project all the individual source files to the same default anatomy, I can then, for example, obtain FFT from each subject's source file in the group analysis folder, and then perform group level analysis on those FFTs.
I noticed that I can also do this in the opposite order, meaning first obtaining FFT using each subject's own source file, then project everyone's FFT file to a default anatomy.
I have compared the FFT (whole brain FFT in my case) files obtained with these two different orders. The two FFT files look very similar, but not exactly the same.
My question is does it matter at which stage I project sources to default anatomy?
Thank you very much!