red/yellow indicates that the contrast is postive. The contrast is:

gamma = -1*beta1 + 1*beta2 + 0*beta3 + 0*beta4 + 0*beta5

so, if beta1 corresponds to group1 and beta2 group2, then gamma = -group1 + group2

so when gamma > 0, it means that group2 > group1

doug

Juergen Haenggi wrote:

Dear Freesurfer users

We have done a cortical thickness group comparison, but we are not absolutely sure which color corresponds to which contrast. In our *.mat file we specified -1 1 0 0 0 0, but the sig.mgh file shows both directed contrasts (group1 > group2 and group1 < group2).

Where can we look which color corresponds to which contrast? We searched for the answer in the archives, but did not find it!

Thanks in advance Best regards Juergen

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Juergen Haenggi Ph.D. (Dr. des.) Division of Neuropsychology Institute of Psychology University of Zurich Binzmuehlestrasse 14, PO Box 25 8050 Zurich, Switzerland 0041 44 635 73 97 (phone office) 0041 76 445 86 84 (phone mobile) 0041 44 635 74 09 (fax office) BIN 4.D.04 (office room number) j.haenggi@psychologie.uzh.ch (email) http://www.psychologie.uzh.ch/neuropsy/ (website) http://www.juergenhaenggi.ch (private website)

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