Hello,
I have a few questions about HLA with covariates of interest, and I am a
novice at doing this in FSL. My design is this: 1 group, several first-level
contrasts of interest, and several questionnaire measures. What I would like
to do is see how individual subject activation on the contrasts correlates
with the questionnaire measures. I am switching over to FSL from AFNI...so
previously I could do two things: correlate whole brain activation for all
subjects on a contrast with questionnaire values, OR extract mean subject
values for a contrast of interest using clusters from the group contrast as
an ROI and then correlate those values with the questionnaire. I am really
interested in setting up this latter case in FSL.
I have followed the help list, and so far have set up my analysis so that my
EVs are my group mean and my demeaned questionnaire scores. I am still not
clear on how to set up the contrasts if what I am interested in is the
correlation of the First-Level contrast and the questionnaire data. I am
also not sure if masking with a thresholded first-level contrast is the way
to get the results I'm hoping for. Finally, if I include multiple
questionnaires, will I be changing the correlations of contrast-each
individual score?
Group EV1 EV2 EV3 EV4
1 1 3.5 4 2
1 1 -2 3 -1
etc...?
Thank you for the help--I'm having difficulty putting what I need into
words, and I realize this isn't the clearest explanation, so please let me
know if there is more information you need.
Jessica
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