Hi Jun,
You would only use the ICs of interest and concatenate each subject into a long array. Do this for each modality and then run FLICA stating that you have the 3 modalities.
As for the resolution, these two papers have a good description about it
Groves et al., Linked independent component analysis for multimodal data fusion. Neuroimage, Feb 2011, 54(3):2198-2217. PubMed #20932919.
Groves et al., Benefits of multi-modal fusion analysis on a large-scale dataset: Life-span patterns of inter-subject variability in cortical morphometry and white matter microstructure. Neuroimage, Oct 2012. PubMed #22750721
dominic
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