Hello FSL team,
we are performing group ICA on resting network data across different
physiological states, using the time concatenated version of group ICA.
We pooled subjects of all four conditions into the analysis, as we expect some
changes of component strength across the four conditions.
We are wondering if components need to be significant across the whole group
if the different conditions should be compared in the end.
The more specific questions are:
(a) What exactly do negative mode values (in the boxplot) indicate in
comparison to positive values? Does ANY deviation from zero indicate
contribution of that subject to the network?
(b) If the component is explaining variance to a non-significant degree, what
does this actually indicate? Can this component still be comared across our
four conditions (given, it is a meaningful component and multiple testing is
corrected for etc.)
Thanks a lot for any hints on this,
Philipp
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