afni.nimh.nih.gov

If you have the most recent version of AFNI, underneath the threshold slider bar you should see the q value at the current voxel other than the p value of the statistic (t in this case). The q value is the corrected value for FDR (a voxel-wise approach to dealing with multiple testings problem). If you feel that FDR is too strigent, try the family-wise approach with AlphaSim.

Gang