Cornelius,
> is there a way to tell SPM2 to only show clusters with a size >= k and a
> p(Cluster) >= 0.05 on the glass brain display (and leave out all
> clusters that don't reach significance) ?
No, I'm afraid that option hasn't been available since SPM96.
What you can do, is manually figure out a desired corrected
cluster size threshold, and then enter that as the extent threshold.
Here's a code snippet. I haven't had a chance to try it out. If you
give it a try and then get back to me with problems/fixes I'll
then make a post to the list with a final version.
-Tom
load SPM
df = xX.erdf;
R = SPM.R;
S = SPM.S;
u = spm_invTcdf(1-0.01,df);
% Repeatedly run these lines with different cluster size thresholds
% until you get the corrected P you want
k = 10 % Guess at cluster size threshold
Pc = spm_P(1,k,u,df,'T',R,1,S)
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