Hi all,
for a patient study we have a DTI scan (for which we ran tractography) and a task-based fMRI scan for which I conducted some PPI analyses. I have some specific hypotheses that the PPI effects might be driven by group differences in white matter structure. We have run the DTI tractography and I would like to compare the groups for their PPI against their respective FA values. I am not sure how to do this.
For the tractography, I get let's say 20 values (one FA value for each participant). If I am now interested in my PPI obtained via SPM, should I then simply use the PPI.ppi values or is there some other more specific value that I can extract for a given connectivity? For example, if my PPI analyses showed functional connectivity (at p<.001 voxel-based level) between the amygdala and the MFG, how would I be able to extract the value for this specific connectivity in order to compare it against the tract based FA?
Thanks in advance for any suggestions on whether this is a) possible and b) meaningful.
Sven
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