Dear AFNI experts,
I have a question how to go about FWE cluster-wise correction after a mild smoothing applied only for the group analysis.
I ran a multivoxel pattern analysis on a native space (without any spatial smoothing), but I wanted to apply a very mild smoothing just prior to the group analysis (i.e., smoothing right after spatial normalization step).
So in this case, I would like to know how I should run 3dClustSim. I read that -acf option takes residual time series (in the standard space), and in my case I only want the smoothing for the group-level… Should I regenerate residual time series in non-smoothed native space data, and run 3dFWHMx to get parameters for acf?
Also, I make use of 3dLME because of some covariates with multiple factors (but also sometimes 3dttest++).
Thanks for your help,