Dear Sebastian,
To estimate smoothness of the residuals you can use function 'smoothest':
smoothest -r res4d -d 'your degrees of freedom' -m mask
The level of image smoothing at the pre-processing stage has impact on the statistics and on the residuals, so yes: if there was no smoothing, it is still relevant to know how smooth the statistic or residual map is.
Best,
Wiktor Olszowy
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