the selection of 'volume' as a dependent variable in qdec is not yet implemented. only thickness is currently available as the dependent measure. the command-line mri_glmfit can be used for a volume analysis though (outside of qdec).
for an independent variable, a volume measure, whether it be hippocampal volume, or volume of a cortical ROI, such as the fusiform gyrus parcellation, can be selected. but note that the analysis will be checking if the volume of fusiform gyrus has an effect on whole brain cortical thickness, which is kind of an unusual question, or at least is a very different from an analysis comparing the volume of fusiform gyrus between two groups (which if i understand your prior emails, is what you have done in SPM).
n.
On Tue, 2010-10-12 at 18:44 +0800, Jay Ives wrote:
Hi,
I am wondering what is going on "under the hood" when one makes a choice under the Design tab in the Measure (Dependant Variable) box for Measure. For example if one chooses "Volume" instead of Thickness, what exactly is being used as volume? Where does the information on volume come from? I am hoping the answer will be the volume associated with each vertex, but where is this information?
Thanks....J
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