Hi all (and Christian in particular),
I am interested in running a TICA analysis comparing resting state and
also video watching between two groups. From reading the posts and
information on the FSL website, I think I should be using the same
methodology described in the Damoiseaux 2007 Cerebral Cortex paper, where
the data is fourier transformed prior to running the TICA analysis. I was
wondering if you could tell me the process used to transform the data
prior to running the TICA?
I would also like to be sure that I understand exactly what is being
compared between groups in this analysis. When the data is transformed,
does this mean there is power spectrum information in each voxel? Are
networks then identified by shared power spectra? And when group
differences are evaluated in contrasts, a significant difference means
that the spatial maps identified within the power spectrum for that
component are different between groups?
Thanks for any insights you can offer,
Christina
|