Hello,
I am getting a similar error after using FIX to preprocess the data. In our experiment, we have three runs per subjects. During each run they receive 6 high heat stimuli, one low heat and they rate after each stimulus. At the first level, we have 3 regressors (high heat, low heat and ratings) and contrasts looking at positive and negative activation associated with high heat.
The first level runs smoothly. The issue occurs when we run the second level within subject, but across runs.
I looked at the varcopes of the first level, but there is only a few voxels activated at the bottom of the image in the spinal cord.
What surprises me is that I don't get this error after using a preprocessing without melodic and the varcopes look similar to the one after FIX.
The only thing that comes to mind is that sometimes FIX seemed to had a hard time classifying the components that included strong physiological activation in the spinal cord, although in our training dataset we consistently classified it as noise.
Could you please advise on what we should do next?
Thank you,
Marie-Eve Hoeppli
########################################################################
To unsubscribe from the FSL list, click the following link:
https://www.jiscmail.ac.uk/cgi-bin/webadmin?SUBED1=FSL&A=1
|