Dear Alfonso,
Thank you for your reply!
Just to make sure I understood properly (also based on Goelman, 2004 about RCOR): the 1/2/3 represent the radius in the x/y/z directions in which voxels are included in the correlation matrices (1 correlating a voxel with its immediate neighbours in 3D, 2 with the ones a bit furthest,...)? And between the voxel of interest and every one of those voxels included, there's a vector field with an amplitude representing the strength of their correlation and a direction corresponding to their relative position, all of which are simplified into an average vector, right?
Also, RCOR is how neighbouring voxels' LOCAL connectivity patterns are correlated, while RSIM is how neighbouring voxels' GLOBAL connectivity patterns are correlated?
Finally, are there any recommendations on which RCOR and RSIM measures (between 1/2/3) that are better to use (more sensitive, better replicability)? I just think I would have a hard time explaining why they yield such different results and the significance of these results.
Sorry for all the confused questions and thank you again for our help!
Rosanne
Thank you for your reply!
Just to make sure I understood properly (also based on Goelman, 2004 about RCOR): the 1/2/3 represent the radius in the x/y/z directions in which voxels are included in the correlation matrices (1 correlating a voxel with its immediate neighbours in 3D, 2 with the ones a bit furthest,...)? And between the voxel of interest and every one of those voxels included, there's a vector field with an amplitude representing the strength of their correlation and a direction corresponding to their relative position, all of which are simplified into an average vector, right?
Also, RCOR is how neighbouring voxels' LOCAL connectivity patterns are correlated, while RSIM is how neighbouring voxels' GLOBAL connectivity patterns are correlated?
Finally, are there any recommendations on which RCOR and RSIM measures (between 1/2/3) that are better to use (more sensitive, better replicability)? I just think I would have a hard time explaining why they yield such different results and the significance of these results.
Sorry for all the confused questions and thank you again for our help!
Rosanne