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My peak_nii toolbox has an option for finding the details about the current cluster.

In SPM, look at spm_list.m lines 752-793. This identifies the voxels of the current cluster, then you could count the number of voxels.

Best Regards, Donald McLaren
=================
D.G. McLaren, Ph.D.
Research Fellow, Department of Neurology, Massachusetts General Hospital and
Harvard Medical School
Postdoctoral Research Fellow, GRECC, Bedford VA
Website: http://www.martinos.org/~mclaren
Office: (773) 406-2464
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On Wed, Aug 21, 2013 at 10:08 AM, Bingjiang Lv <[log in to unmask]> wrote:
Dear all,

I'd like to ask whether there exists a function (or .m file)  in SPM that can return the size of an activated cluster. I mean that this function can return the size of the current cluster when given the coordinates, p-value and extent threshold k. It's might exists in the code for the [current cluster] button in the "SPM{T}: Results UI panel", but I didn't find it. Could anyone give a hand for this? Thanks a lot!

Best regards,
Bingjiang