Thank you for the reply. I am trying to do multiple comparison correction on
my results. When I use AFNI, I was frustrated by the program used in AFNI to
estimate the spatial correlation (smoothness) of the EPI data.
When I searched the literature, I found some applications using SPM (e.g.
"Functional connectivity in the resting brain: A network analysis of the
default mode hypothesis, Greicius et al, PNAS 100:253-258), thresholds their
results at HEIGHT threshold p<0.01 and EXTENT threshold p<0.05. What's the
connection or difference between this HEIGHT and EXTENT p value and the
corrected p value? Given an SPM map (e.g. t-score map), how can I get the
HEIGHT and EXTENT p value (corresponding to a certain t-score and cluster
size, I believe) using SPM? It would be great if you can point me to some
instructions or literatures on how to do this.
Thank you very much,