Hi Catherine,

Thank you for the X-matrix file. The collinearity issues are not sooooo bad, but they seem to be coming from the motion parameters, not the regressors of interest. Try running these commands:

xmat_tool.py -load_xmat rf_matrix_tosend.1D -no_gui -show_conds
1d_tool.py -infile rf_matrix_tosend.1D -show_cormat_warnings_full

The first shows small condition numbers for the main and (non-motion) baseline regressors, but a very large condition number for motion (and motion+others).

Looking at pairwise correlations from the second command, the high correlations seem to be between each motion parameter and its square.

So these are not bad things, but as they are correlated enough, the programs are whining about them. You might want to run these commands regularly, and verify that the high condition numbers are only due to motion squares.

Does that seem reasonable?

- rick