Hello,
Does anybody know how fsl handles contrasts between events with unequal cell sizes?
Example:
I want to find areas showing greater activation to Event B than to Event A. Every participant is in both conditions (paired samples), but by design Event B occurs less frequently than Event A, because it's supposed to be a surprising event. My question is, if I set up a simple 1,-1 contrast (method of subtraction), does FSL do some automatic differential weighting of the means or otherwise account for the difference in cell-sizes in an appropriate way? What is the usual way of handling this issue in fMRI analyses?
-John
|