Dear HCP users,

Recently, I have tried to calculate the zero-order correlation between some
brainstem ROIs and the cortical vertices. Looking at the mean subjects'
correlation map, the connectivity pattern totally makes sense. Even after
doing the statistical testing (using permutation based on maximum
t-statistics) the significant correlated clusters are located in the
expected areas. However, the magnitude of the correlation coefficients are
very small (in the order of 0.05 for the peak vertices in the mean map). I
have also done the volume-based voxel-wise analysis for the same brainstem
ROIs and I had similar findings there.
Is there any explanation for such small r-values even though the
significant correlations seem to be meaningful?

Thank you all,
Amin

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