Hi all,
We have run separate simple regression analyses for two groups (control
and patient) with a single behavioral variable as the regressor. We
obtained 4 contrasts - the positive correlation [1] and the negative
correlation [-1] for each group. As the next step, we would like to compare
the groups, to see where the correlations differ between the groups, on a
voxel-wise basis. We would like to see voxels in which controls have
steeper correlations than patients, and vice versa (afterwards, we would
perform post-hoc analyses to characterize whether the correlations were
"more positive," "less negative," etc...). How can I implement this
comparison of correlations between groups in SPM2? Thanks so much!
Dani
Daniel Simmonds
Developmental Cognitive Neurology
Kennedy Krieger Institute
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