Hi, I'm trying to understand the output of the SPM results procedure using
the corrected extent threshold. when I run the SPM{Z} function to get a
listing of maxima, I tell it to use a height threshold of 0.01 and a
corrected extent threshold of 0.05. My impression was that this corrected
extent threshold corresponded to the cluster-level (conjoint height and
extent) p-value. however, some clusters make it through to the maxima
listing which have both a cluster-level p > .05 and a corrected
voxel-level p > .05. Can someone please clarify what the relationship is
between the chosen threshold and the reported maxima, and whether all the
clusters that are reported really do satisfy the corrected extent
threshold?
thanks,
russ
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Russ Poldrack Phone: (650) 725-0797 (NOTE NEW AREA CODE!)
Dept. of Psychology Fax: (650) 725-5699
Stanford University
Jordan Hall Email: [log in to unmask]
Stanford, CA 94305 Web Page: http://www-psych.stanford.edu/~poldrack/
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