Dear Christine,
How many degrees of freedom did you have in your analyses? At low degrees of
freedom the SPM t statistic to Z score transform is biased, which can lead to
false positive results in the corrected statistics in SPM96. See:
http://www.mrc-cbu.cam.ac.uk/Imaging/randomfields.html
especially the differences between the sample SPM96 and SPM99 printouts, and
the 'More sophisticated random field thresholding' section.
Regards,
Matthew
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