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 normalExternal Email - Use Caution
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?
It can be done in fsaverage or the native subject surface space, it is not related.
- Can I obtain this within-subject contrast by staying in the native subject space?
No, see above
- Do I have to concatenate both runs and create a new parradigm file?
Thanks for your support
Sincerely
Chris
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