Hi,
I want to compare fMRI signals during a task performance between patients and healthy controls. To clarify whether the decreased regional activation in patients is a functional decrease but not proportional to decreased gray matter volume (GMV, from a VBM analysis), I hope to control for the GMV difference and hence would like to use voxel-wise GMV as a covariate in fMRI voxelwise two- sample t-test between control and patient groups. Could any expert show me how to do it? I have no idea where and how to input VBM data in fMRI model specification in SPM8. Thanks.
Mike
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