Hello John,
thanks for pointing to the Rohlfing and Tahmasebi papers, I didn't know about them. Well, it seems there is no easy solution then. My subjects are aged 16 to 17, so I would have been interested in differences between age-specific TPMs and standard TPMs plus differences related to spatial smoothness of the TPMs. However, I'm not after evaluating different algorithms, at least at the moment. Rather I want to analyse some fMRI data, and I would have liked to "prove" why it was a good idea to go with some specific TPMs during preprocessing. I guess I'll use the default parameters / 6 TPMs in SPM12 then ;-)
Best,
Helmut
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