afni.nimh.nih.gov

Hi Chuck,

Yes, the betas are the regression coefficients,
the labels for which have _Coef in the 3dDeconvolve
output.

The interpretation of the magnitudes depends on
any scaling of both the EPI data and the regressors.
We tend to scale the EPI to a mean of 100 and the
regressors to be of unit height. That allows for
interpretation of betas in terms of percent signal
change.

- rick