Hi, FS experts:
I'm scanning freesurfer pages about FSGD files here:
http://surfer.nmr.mgh.harvard.edu/fswiki/Fsgdf4G1V
and i'm interested in one contrast file(the example of Contrast 5
right-left.intercept.mtx). The original FSGD file is list as follows:
GroupDescriptorFile 1
Title OSGM
Class MaleRight
Class MaleLeft
Class FemaleRight
Class FemaleLeft
Variables Age
Input subject1 MaleRight 30
Input subject2 MaleLeft 40
Input subject3 FemaleRight 50
Input subject4 FemaleLeft 60
The contrast file is : 0.5 -0.5 0.5 -0.5 0 0 0 0, meaning to exame the
difference between Righties and Lefties regressing out the effects of gender
and age.
Now i consider gender as the covariate variable ('1' represents the Male and
'2' represents the Female), and i setup a new FSGD file:
GroupDescriptorFile 2
Title OSGM
Class Right
Class Left
Variables Age gender
Input subject1 Right 30 1
Input subject2 Left 40 2
I also want to exame the difference as suggested above, and I setup the new
contrast file as :1 -1 0 0 0 0.
My question is that : are the new FSGD and contrast files correct to exame the
difference as suggested by original FSGD and contrast files?_______________________________________________
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