Dear list,

I am new to Freesurfer and I have a doubt about the Talairach transformation. As far I understand, the Talairach transformation is applied to compute the surface representations. However, this seems to be a “hidden“ step, i.e. no volume is saved as Talairach transformed. Is this correct? Do the final surfaces (and parcellations) show the brain before or after Talairach transformation? I am asking this because I need to extract ROIs in the original space, i.e. before Talairach transform.  

Thanks a lot for your help

Roberta