I'm not sure what you are trying to do. sound like you have two values per voxel for each subject that you want to correlate, but you can't really correlate two values. I think I'm missing something ...

doug

Cameron Ellis wrote:

Does anyone have an answer to this question?

Hello,

I am looking for a way to perform voxel-wise, within-subject correlations of two activation maps (in talairach space). The two existing maps reflect encoding and retrieval runs of a memory task. The idea would be to generate a correlation map across all subjects, to identify clusters where there was a positive or negative correlation between encoding and retrieval activation.

I've seen this done with SPM but not Freesurfer. Any suggestions? (Perhaps this would involve glmfit?)

Many thanks, Josh _______________________________________________ Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer