In other words, you first have to find out the T or F value that corresponds to .05 FWE for the small volume (e.g. via steps (1) to (3) ). Once you know the value you can threshold the SPM accordingly, but you have to define the small volume another time nonetheless as otherwise, 1) voxels outside of the small volume would end up in the results table 2) the peak-level pFWE-corr values in the table would still reflect .05 FWE on the whole brain and not those for the small volume.
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