[Marsbar-users] how to proceed further with ROIs

[KIDLAB K. I. f. A. S. <kra...@gm...>]

Dear all,

We have completed the second level analysis of an SPM study with 30
subjects. We created functional ROIs from the results and structural ROIs
(both BA and anatomical regions) from WFU PickAtlas. We used the statistic
table for these different ROIs to further confirm our results. My question
is, how can we go further with our data using Marsbar? I think there is more
potential for ROI analysis than what we have. We have been reading the
forums and tried to do percent signal change using the functional ROIs on a
subject level. Then we averaged across the 30 subjects but the results are
split positive and negatives. This is to be expected apparently, as we read
in an earlier posting (although we are not sure why). We have tried to look
at the FIR timecourse but are unsure, should we take the datapoints of the
timecourse of the second-level fROIs and then average across all subjects?
We were caught up in trying to manage the number of datapoints. We would
like to do more, but seem limited on the second level stage and not sure how
to proceed on the first level - should we do individual ROIs or use the
second level ROIs? Any guidance would be greatly appreciated!

Thank you so much,
Kidlab
Krasnow Institute for Advanced Study
George Mason University