Hello AFNI experts,

I have two z-scored co-activation maps. I would like to compare the spatial overlap between these two maps by computing the Dice Coefficient.

The first step in preparation of doing this, is that I need to threshold and binarize the two co-activation maps.

The co-activation maps consist of both positive Z-scores (activations) and negative Z-scores (deactivations).

I would like Z scores between 1.5 and 4 to be marked as "1s" and Z scores between -1.5 and -4 to be marked as "1s". The rest will be "0s" when binarizing.

Is there a way to do this with 3dcalc.

I was also curious if there is a way to compute the dice coefficient with AFNI?

I found a way to do it via an R and FSL interface, but even better if there is way to do all of this in AFNI.

Thanks for your time and expertise!

Emily