afni.nimh.nih.gov

Florin,

I don't feel comfortable enough to recommend the modeling approach implemented 3dGC even though I wrote the program more than 10 years ago. As for PPI, check out the following video:

[cbmm.mit.edu]

Another possibility is to model the effect associated with each occurrence of high/low word, and perform what is called beta series analysis in the literature.

Gang