help > functional MRI contrast maps: 2 overlays showing hypo-/hyperactivation and negative/positive values on colorbars
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Dec 14, 2022 09:12 AM | Sarah Gerhardt - CIMH Mannheim
functional MRI contrast maps: 2 overlays showing hypo-/hyperactivation and negative/positive values on colorbars
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
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
Dec 14, 2022 11:12 AM | Chris Rorden
RE: functional MRI contrast maps: 2 overlays showing hypo-/hyperactivation and negative/positive values on colorbars
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.
Dec 14, 2022 11:12 AM | Sarah Gerhardt - CIMH Mannheim
RE: functional MRI contrast maps: 2 overlays showing hypo-/hyperactivation and negative/positive values on colorbars
Dear Chris,
thanks a lot for your reply and the information!
thanks a lot for your reply and the information!