AFNI experts,

I was wanting to do voxel-wise (or, node-wise via use of the surface mapped data) correlation analysis at a group level. I was looking through available 3dXXX programs, and at first I thought that 3ddot might do what I was looking for, but now I am not so sure, as it seems to only take 2 datasets as input.

What I want to look at is at each voxel (or at each node) whether variable X (such as % signal change) and varibale Y (anatomical variable, such as cortical thickness) correlates, at a group level. In other words, I am looking for voxels (or nodes) where cortical thickness and % signal change correlates when looking at a group of individuals. Since other programs (such as 3dttest++) can handle voxel-wise covariate, I am positive afni is able to compute voxel-wise correlation between two variables. But I was wondering if I am able to get a coefficient r for such analysis, and which program I should use for that purpose.

Thank you so much for your expertise.

Nobuko