Dear all,
I was wondering how one would be able to demonstrate that
- in fMRI studies using
- a paradigm, that includes blocks with neutral stimuli and emotional stimuli
- the contrast neutral vs. emotional might results in both
- hypoactivations (neutral > emotional) and hyperactivations (neutral < emotional).

I would therefore like to add overlays, demonstrating these opposing direction of activation.

How would I be able to this, e.g. adding one overlay including the contrast map with the full information on both directions - or should it be prepared outsides of MRIcro GL first?

I am happy to receive any input that helps me with this :)

Best, Sarah

The Scripting / Templates / basic menu item shows precisely this situation, where a statistical map 'spmMotor' is loaded as an overlay twice, with positive values being given the red color scheme and negative values given the blue color scheme. You can achieve the same result by using the graphical user interface to choose File / AddOverlay option to load the overlay twice. You can create statistical maps with AFNI, SPM or FSL. Andrew Jahn has some great web pages and videos to describe the processing and visualization.

Dear Chris,
thanks a lot for your reply and the information!