On 3/6/2020 11:15 AM, Milde, Christopher wrote:
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Dear Freesurfer Experts,
I have a very basic questions about creating subject-wise contrasts
between runs
*
*
*Background*
Study with two runs per subject where each run corresponds two a
different condition (i.e. Stimulation A (on - off) and Stimulation B
(on - off).
I performed the preprocessing and 1st levels stats in the native
subjects space
*Questions*
* How can I obtain a within-subjects contrast between two runs (the
Stimulation A vs. Stimulation B ) obtained in two runs within one
session?
The easiest way is to code the conditions differently in the paradigm
file (eg, instead of two conditions, you'd have 4, ARun1, BRun1, ARun2,
BRun2), then just create contrasts as normal
* Can I obtain this within-subject contrast by staying in the native
subject space?
It can be done in fsaverage or the native subject surface space, it is
not related.
* Do I have to concatenate both runs and create a new parradigm file?
No, see above
Thanks for your support
Sincerely
Chris
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