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You need to include subject terms in each contrast as subject should be a factor in your model. Best Regards, Donald McLaren ================= D.G. McLaren, Ph.D. Postdoctoral Research Fellow, GRECC, Bedford VA Research Fellow, Department of Neurology, Massachusetts General Hospital and Harvard Medical School 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, Dec 2, 2010 at 12:24 PM, sheng zhang <[log in to unmask]> wrote: > Dear all, > > Does someone know how to apply a second level conjunction analysis > across subjects? > > From previous emails, one way seems to use flexible factorial > analysis. Let's say I have con_A.img, con_B.img, and con_C.img each > for A1>A2, B1>B2, and C1>C2 under subject level. So the idea is to > build a flexible factorial model with subjects and 3 conditions each > for con_A, con_B, and con_C. And then set contrast [1 0 0], [0 1 0], > and [0 0 1] to get activation each for A1>A2, B1>B2, and C1>C2, and > finally select all three contrasts to do conjunction of A1>A2 and > B1>B2 and C1>C2. > > But, spm do not allow to set a contrast as [1 0 0] or [0 1 0] or [0 0 > 1] for this flexible factorial model, which might because there is no > "baseline". So, how should I do to get the second level conjunction of > A1>A2 and B1>B2 and C1>C2? > > Thanks, > -- > Sheng Zhang >