Hi Gang,

I understand slope effect and intercept are two different outputs. In this case it will be fair enough to use the same parametric modulation for the all regressors included in contrasts (e.g. I and B), if we are sill interested in looking at some contrast (e.g. S-I, S-B)? Alternatively, we can use the parametric modulation only for a specific regressor, without considering any contrast (e.g. S-I, S-B)?

Also, as I previously mentioned, I got the error message related with the selector for the indexes (index 1 for SPMG1 and indexes 2 and 3 for SPMG2). However, I still got the sub-briks of those contrasts, even if the error showed up. I don't understand why the sub-brik was still generated (since it is not interpretable)? How was this output/sub-brik computed, in this way S[1]-I[0] (which is not meaningful)?

Thanks,
Ruben.