Dear Tiago,
For SVC on cluster level it's easier,
(1) select the contrast, enter the initial uncorrected threshold you want to work with
(2) specify the small volume
The cluster statistics in the results table are updated then with SV-adjusted statistics (per default .05 FWE), and voxels/clusters outside of the SV are removed automatically (but are still shown in the glassbrain). The size of the smallest, still sig. cluster is shown at the bottom of the table as FWEc.
In case you want the table to show only sig. clusters, you would repeat (1), again enter the initial uncorrected threshold but this time followed by FWEc for the extent threshold. Then (2), as otherwise, the table would show results on the whole brain.
Best
Helmut
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