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Dear SPMer, Are there any criteria to choose number of voxels as extend threshold for an activation map? Does it need to reflect the smoothness of the images? I am thinking of using 1 resel (e.g. 1 resel = 50 voxels) as threshold. Is this a good or bad choice? Thanks, Ping ====================================== Ping Zou, Ph.D. Neuroimaging Scientist Radiological Sciences St. Jude Children's Research Hospital (tel) 901-495-2892 (fax) 901-495-5706 [log in to unmask] ======================================