[Neuroimaging] GC analysis with nitime

[Mike V]

Hello,

I'm following the Granger Causality tutorial in the nitime's webpage but I
have few questions:

1- In the tutorial the values f_ub = 0.15 and f_lb = 0.02 are used for the
bounds on the frequency band of interest. Are these values recommended for
all resting state data-sets or do they depend on the particular acquisition
parameters?

2- I do not understand the causality plots (fig03 and fig04), they are both
blank. What does it mean? I was expecting some variation like in the
coherence and correlation matrices...

3- the tutorial shows the analysis of one single subject. How can I compute
group statistics? Can I simply extract the values stored in g1 and then run
a one sample t-test across all subjects' g1 scores?

4- how can I get GrangerAnalyzer to display significance?

5- I noticed that the tutorial data has been motion corrected only. Is it
not necessary to correct for other sources of noise like physiological
noise and linear drift before computing GC?

Many thanks in advance!

Best regards,
Mike
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