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You need to do each session separately. If you set the p-value to .999, then you select voxels that are not activated. 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 Tue, Jan 4, 2011 at 9:15 PM, junhai xu <[log in to unmask]> wrote: > Dear SPMers, > > SPM5 asks me which session should be chosen when the first eigenvariate was > extracted in doing PPI analysis. Our design contains 6 sessions. > I want to get the first eigenvariate from the whole 6 sessions. So which > one should be chosen? > > Another problem: for each subject , can I extract the first eigenvariate > from the point that isn't activated. > > Thanks. > > Best wishes, > > Junhai > -- > Junhai Xu > Research Center for Sectional and Imaging Anatomy > Shandong University School of Medicine > No. 44, West Wenhua Road, Jinan, Shandong > 250012 P.R. CHINA > > Tel: +86-531-8838 2093 > >