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Dear Ping, might be that you will be interested in a script written by Scott Slotnick: http://www2.bc.edu/~slotnics/scripts.htm (cluster_threshold_beta.m) This calculates monte-carlo simulations to obtain an extent threshold k, which is in a way suitable to correct for multiple comparisons. You should read instructions in the file for detailed information. Cheers, Thilo On Tuesday 20 September 2005 23:22, Zou, Ping wrote: > 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] > ====================================== -- Thilo Kellermann RWTH Aachen University Pauwelstr. 30 52074 Aachen Tel.: +49 (0)241 / 8089977 Fax.: +49 (0)241 / 8082401 E-Mail: [log in to unmask]