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If you have 3 conditions plus fixation; I'd suggest gPPI: http://www.nitrc.org/projects/gppi) 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, Feb 20, 2012 at 4:09 AM, Omar Mothersill <[log in to unmask]> wrote: > Dear SPM users, > > I wish to perform a PPI analysis, but am unsure what to input in the > section 'Input variables and contrast weights.' I have a working memory > task with 3 conditions (1 is baseline; 2 and 3 are two levels of working > memory load). I want to examine connectivity with my seed region for > working memory (any load) compared to baseline. Judging from the SPM > manual, I should specify the n x 3 matrix as: > > [1 1 -2; 2 1 1; 3 1 1] > > Would this be correct? > > Any advice would be greatly appreciated. > > Thanks, > > Omar > > -- > Omar Mothersill > > Room 0.18 > Neuropsychiatric Genetics Group > Dept. of Psychiatry > Trinity Centre for Health Sciences > St. James's Hospital > Dublin 8. > > Phone: 01 896 2464 > Email: [log in to unmask] > >