Dear SPMers!
I am not sure whether my question has been already posted (however, I could
not find a similar question in the archives).
For DCM, which VOI size (e.g. for a sphere) should be used? (I guess that
there is probably no optimal VOI size)
e.g., a radius of 8 mm (=1,6 cm sphere) or more appears to be quite large
when, e.g., a time series from the motorcortex should be extracted...
Is it dependent on the smoothing kernel?
thanks!
Christian
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