Hi Anwesha
I don't know if you still need help with the analysis of the Granger connectivity data.
My workflow so far when I want to analyse Granger connectivity data is as follows:
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export the Granger data from each subject.
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exporting the MNI coordinates from the centre of the scouts.
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statistical analysis of the Granger connectivity data with NBSDirected NITRC: Network-Based Statistic (NBS): Tool/Resource Filelist