After using “Clusterize” and “Rpt” buttons to generate the table of clusters, I notice that the XYZ coordinates and Z score obtained for the peak of each cluster in the table is different for the following 2 cases:
(1) Click “Jump” to move to the peak of a cluster, then observe the Z score value shown at "Thr = … " on the bottom of the main GUI windows.
(2) I first click on “Write” to write out a dataset for the cluster, then run 3dExtrema with the cluster dataset as mask to output a few local maxima points, then I take the first point with highest Z score.
The Z score of the peak obtained from (2) is higher than that from (1).
And when moving to the XYZ coordinates obtained from (2), "Thr = … " really shows a higher value than (1).
I feel that I am missing something important here.
Could anyone please explain the difference.
My clusters are quite small, and the difference in terms of XYZ is just a few mm (still in the same atlas ROI), but I expect the peak should be the same for (1) and (2). (!?)