Hi Gang,
We modified the afni_run_R script to run the 64 bit version of R (rather than the 32 bit) and my analysis runs. In terms of the 19 time points, they are the subbrik outputs of the iresp files that are generated by 3dDeconvolve. We enter them in separately in the group analysis so that we can look at a "main effect of time" collapsed across all other factors of interest so that it is unbiased with respect to the effects of interest. We use this method in our lab to define functional ROIs.
thanks for the help!
Aarthi