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My approach is to threshold each map, then convert them to 1s and 0s, then use imcalc to form the sum of all of them. If I only have a few images to form a conjunction, I sometimes weight each image to see which images overlap in different locations. Best Regards, Donald McLaren ================= D.G. McLaren, Ph.D. Research Fellow, Department of Neurology, Massachusetts General Hospital and Harvard Medical School Postdoctoral Research Fellow, GRECC, Bedford VA Website: http://www.martinos.org/~mclaren Office: (773) 406-2464 ===================== This e-mail contains CONFIDENTIAL INFORMATION which may contain PROTECTED HEALTHCARE INFORMATION and may also be LEGALLY PRIVILEGED and which is intended only for the use of the individual or entity named above. If the reader of the e-mail is not the intended recipient or the employee or agent responsible for delivering it to the intended recipient, you are hereby notified that you are in possession of confidential and privileged information. Any unauthorized use, disclosure, copying or the taking of any action in reliance on the contents of this information is strictly prohibited and may be unlawful. If you have received this e-mail unintentionally, please immediately notify the sender via telephone at (773) 406-2464 or email. On Thu, Sep 25, 2014 at 10:02 AM, Steph Sutliff <[log in to unmask]> wrote: > Hello, > > I have a question regarding conjunction analysis in spm8. I would like to > do a conjunction null test using the minimum t statistic to test the > conjunction of a contrasts between two groups. This requires a total of 2 > spm.mat files, as each group is modeled separately. If possible, I would > also like to continue this conjunction analysis by examining two contrasts > in two groups, resulting in a total of 4 spm.mat files. > > I do not want to test fixed effects, but simply perform a conjunction of > two group results, so am I correct in assuming that I should not do a > conjunction of all subjects together? Also, how do I implement a > conjunction in spm8 with more than one spm.mat file? It seems that I can > choose only contrasts from a specific spm.mat file. > > I really appreciate your help with this! Thanks so much. >