[Freesurfer] Regression: Activation as a function of condition

Hello Freesurfers,

We are using the Sternberg Item Recognition Paradigm in our study, which involves the memorization and recognition of groups of 1, 3, 5, and 7 letters. Each run has two sets of each condition (load). We want to determine if any regions of the brain activate in a linear pattern with increased task load. I have already done regression analyses using genotype, but that was between subjects, while this analysis would be within subjects. Does anyone know how I could structure an analysis (STABLE 4) that would allow me to look at this? Is this something I have to do at the mkanalysis-sess level?

Thanks,

Adam Nitenson, B.S. Brain Genomics Lab Massachusetts General Hospital