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so just to make sure I understand the manuals ,  if i have 2 test scores for 
each subject and i would like to find voxels correlating with each test and not 
with age  should my design be: 
group  EV1       EV2         EV3
          test1     test2       age
where all scores are demeaned

and the contrasts

EV1      EV2      EV3
                 
1           0         0
-1          0        0
  0         1        0
  0        -1        0
considering i want to find both positive and negative correlations.

thanks
reut