Dear SPMers,
When I use MRIcro to visualize both positive and negative SPM maps, I
need to specify a t threshold, which corresponds to a P value when I use SPM
to visualize the results. Should I report the threshold as 2*P if I show
both the positive and negative values since it is now a two-tail test? If
I'm not wrong, SPM only calculates one tail P value.
Thank you!
---------------------------------------------
Ze Wang, Ph. D
Center for functional neuroimaging,
Dept of Neurology,
Medicine school,
University of Pennsylvania
3400 Spruce Stree,
3W Gates building,
Philadelphia, PA 19104
Tel: 215-662-7341
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