Hi:
We're trying to do a correlation analysis between BOLD % Signal
Change and behavioral performance. The fMRI data is being analyzed
using freesurfer (specifically, the program roisummary-sess, see
https://surfer.nmr.mgh.harvard.edu/fswiki/roisummary_2dsess?
action=highlight&value=roisummary-sess). This program outputs a
couple values (detailed on that page), notably, the number of voxels
in the area, the number that were active above statistical threshold,
and the "mean functional baseline offset". Unfortunately, since I am
a novice in Freesurgfe, it's unclear to me how to get a % signal
change from this data. Presumably, the offset value says something
about the difference in activity between the on and off periods, but
I don't know the exact meaning of this value, and how to get a %
signal change from it.
We get a single output file per run (~280s) and have 12 runs total (8
on day 1, 6 on day 2). We have various behavior metrics
corresponding to each of these.
I'm attaching one of the output files here. Thanks a lot! Lucia
n002-task-3-008
98
32
1093.3451
8.9397
76.000000
3.300000
0.000000
1
1
7.8309
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