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Hi Marcus Actually, it is the probability that a particular voxel belongs to GM or WM. If you take the integral over all voxel values (spatial resolution of voxels 1x1x1mm) within a cluster, you will get mm3 or micro-liter as the unit of the cluster. Regards Jürgen On 24.9.2008 12:19 Uhr, "Markus Burgmer" <[log in to unmask]> wrote: > hi. > > there has a question in a vbm analysis with christian gasers vbm5.1 approach > arise by a reviewer. i can't find an answer in the list about this topic. > maybe somebody can help? > > we performed a test of volumetric differences between two groups of subjects > with helpf of vbm5.1 (modulated images). for each 'significant' cluster we > liked to depict the amount of 'real' differences between the groups in box > plots with help of marsbar. what is the unit of the values extracted? we > thought this would be 'ml'. > > thanks a lot > > markus ----------------------------------------------------------- Juergen Haenggi Ph.D. (Dr. des.) Division of Neuropsychology Institute of Psychology University of Zurich Binzmuehlestrasse 14, PO Box 25 8050 Zurich, Switzerland 0041 44 635 73 97 (phone office) 0041 76 445 86 84 (phone mobile) 0041 44 635 74 09 (fax office) BIN 4.D.04 (office room number) [log in to unmask] (email) http://www.psychologie.uzh.ch/neuropsy/ (website) http://www.juergenhaenggi.ch (private website) -----------------------------------------------------------