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It is the average of the two levels. It is neither a conjunction nor the global effect. It is similar to if you collapsed the two levels in a single 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 Mon, Jan 31, 2011 at 10:25 PM, SUBSCRIBE SPM Yihui Hung <[log in to unmask]> wrote: > Hello, > Can anyone tell me what “the average effect of condition” in second level analysis SPM-fMRI? Assuming I have one factor with two levels, is “the average effect of condition” a conjunction or global effect of the two levels? Thanks for replies in advance! > Sincerely, > Yihui >