Hi Rene,
Those are indeed the uncorrected images. You want to use the ones that end in *_tfce_corrp_tstat. Take a look at the randomise webpage for more information (http://www.fmrib.ox.ac.uk/fsl/randomise/index.html).
Cheers,
David
On Apr 26, 2012, at 9:28 AM, René Besseling wrote:
> Dear FSL users,
>
> I've performed group ICA and group comparison using dual regression. The stage 3 statistics I get include *_tfce_p_tstat*.nii and *tfce_corrp_tstat*.nii maps of (1-p). I'm now a bit at a loss how to interpret the *_tfce_p_tstat*.nii maps; their naming suggests they are uncorrected, however dual regression makes use of permutation testing which would provide multiple comparison correction. Furthermore, the results are threshold-free cluster enhanced (tfce), which suppresses stray (and therefore probably false-positive) significant voxels. I guess this also provides (maybe somewhat informal) control over the Type 1 error. Should I therefore consider the *_tfce_p_tstat*.nii outputs as truly uncorrected or do they deserve more credit?
>
> Best regards,
>
> Rene Besseling
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