Hi Alessandra,

You would use the same one that you input to AlphaSim (not one
that is output). If your input p-value is 0.001, and it happens
to correspond to a corrected p-value of 0.05 for clusters of at
least 17 voxels, say, then you would apply that clustering (using
3dmerge) to create a clustered/thresholded dataset.

In afni you would still set the threshold at p=0.001. But since
you can now view clustered data, that would correspond to a
corrected p of 0.05.

Note that the latest version of afni has a great new interactive
clustering feature, including flashing clusters on and off, to
see which voxels belong to each cluster. That comes as part of
the report feature.

See Bob's description of what he did here:

[afni.nimh.nih.gov]
[afni.nimh.nih.gov]

- rick