Hi,
> (SUB - SUPRA) - (ROI_1 - ROI_2)
>
> SUB = subliminal duration stimuli
> SUPRA = supraliminal duration stimuli
> ROI_1 = amygdala
> ROI_2 = pre-frontal cortex
>
> Creating the first half of the equation is straightforward in the SPM contrast manager, but how do we do a subtraction of two ROIs? Surely volume alone is an issue.
Do you mean:
(SUB-SUPRA) for ROI1 - (SUB-SUPRA) for ROI2?
I think you'd have to do that outside marsbar, by generating sub-supra
values for each subject, and each ROI, and entering them into a
repeated measures analysis...
Best,
Matthew
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