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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
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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]