I am trying to run a second level analysis on a single subject with two scans.
For the first level analysis, I used two contrasts 1 (for positive activation)
and -1 (for negative activation).
For the second level analysis I used the template from the website for a two-
sample paired T-Test. My goal for this analysis was to find the difference in
areas activated and deactivated between scan A and B.
I loaded both feat directories and used the lower-level copes 1 (positive) and
2 (negative). Fixed Effects was used. In the model set up I have 2 EVs.
Group EV1 EV2
A 1 1 1
B 1 -1 1
C1 A-B 1 0
C2 A-B -1 0
The feat report for the second level gives me two lower-level contrasts:
Positive: A-B and B-A.
Negative A-B and B-A
The problem I'm running into is that when you look at A-B for positive and B-A
for negative they are exactly the same. This also applies to B-A for positive
and A-B for negative.
Have I correctly set up my second level analysis to look for a significant
difference between A and B for a single subject? And do these results make
sense?
Thank you for your help,
Eric
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