Dear Matthew,
Thanks a lot for your time and patience!
I understand the ways your mentioned is adding an addition step at the subject level. That is, I do regular analysis in each run within each subject in the 1st run level, then average the first and the second two runs within each subject in the 2nd level, respectively (using feat directories as inputs), then do the higher-level analysis at subject level in a 3rd level analysis (using the cope images of the gfeat directories issued from the 2nd level), and finally average across subjects at a 4th level?
So I set the contrast in the GLM(2 subjects) in the 2nd level,
EV1 EV2 EV3 EV4
sub_01_run1 1 0 0 0
sub_01_run2 1 0 0 0
sub_01_run3 0 1 0 0
sub_01_run4 0 1 0 0
sub_02_run1 0 0 1 0
sub_02_run2 0 0 1 0
sub_02_run3 0 0 0 1
sub_02_run4 0 0 0 1
And set the following contrasts:
EV1 EV2 EV3 EV4
sub_01_sesssion1 1 0 0 0
sub_01_sesssion2 0 1 0 0
sub_02_sesssion1 0 0 1 0
sub_02_sesssion2 0 0 0 1
I'm not sure whether my setting is right?
And I encountered another question,
In the second level analysis, the average results just showed the four contrasts from run 1 in the first level, but did not showed another different contrast from run2. For example, there were four contrasts in the first level in run1 (A1B1, A1B2, A1B2-A1B1, A1B1-A1B2), and four contrasts in the first level in run2(A2B1, A2B2, A2B2-A2B1, A2B1-A2B2), but the Feat result sections only showed the contrast results from run1 (A1B1, A1B2, A1B2-A1B1, A1B1-A1B2). There should be eight contrasts in this level. Could you give me any insights? It will be greatly appreciated for your kind help.
Best
Yangmei
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