Ines,
Unless I'm misunderstanding something, this seems exactly the expected behavior. The HC<PATIENTS contrast image is an exact sign-flipped version of the HC>PATIENTS image, so I would expect any results calculated on one to be sign flipped versions of the other.
-Mike
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Mike Angstadt
Research Area Specialist Lead / PANLab Lab Manager
Department of Psychiatry / University of Michigan
(734) 936-8229
-----Original Message-----
From: SPM (Statistical Parametric Mapping) [mailto:[log in to unmask]] On Behalf Of Ines Del Cerro
Sent: Friday, March 16, 2018 10:06 AM
To: [log in to unmask]
Subject: [SPM] TFCE fliped results
Dear experts,
Firstly I apologize if this subject has previously been treated.
I performed TFCE on two different opposite contrasts introducing the corresponding number on 'Contrast index' on TFCE estimation batch (by error, because I know that is enough to do it only in one of them, so we get the original and inverse contrast results, but I did not realize at that moment).
But thanks to this error, I saw that I got completely flipped results.
On HC>PATIENTS original contrast I get the same results (these one are correct, based on uncorrected SPM results) than in the original contrast of HC<PATIENTS.
When I estimate the same contrasts one by one I have the right expected results, on the basis of uncorr SPM results.
Does anybody know what could go wrong?
Thank you,
Ines
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