Dear Cornelius,

FSL doesn't provided uncorrected cluster P-values anywhere, and there's no convient way to generate them for conjunction cluster inference either.

If it helps, if all you want is uncorrected conjunction P-values, you don't need the easythresh_conj script.  Voxelwise conjunction inference simply consists of taking the minimum of a series of statistic images, and then assessing that image as if it were a single image. 

Hence, you could just use fslmaths; in a Feat directory...

fslmaths stats/zstat1 -min stats/zstat2 -ztop stats/conj_12_uncorrp

fslmaths stats/conj_12_uncorrp -mul -1 -add 1 -thr 0.999 stats/conj_12_1-uncorrp_thresh

will give you the uncorrected voxel-wise P-values for a conjunction of contrast 1 & 2, and a thresholded 1-P image for 0.001 uncorrected.  

Hope this helps!

-Tom

On Thu, May 5, 2011 at 10:50 AM, Cornelius Werner <[log in to unmask]> wrote:

Hello all,

I am trying to do a conjunction on two interaction contrasts. Effects
will not be huge. Therefore, I'd like to go for an exploratory
uncorrected p-value of 0.001 - is that possible? Within the script,
there is the cluster command doing the stats, obviously yielding
cluster corrected p's. Is there a workaround?

Thanks in advance,
Cornelius

--
Dr. med. Cornelius J. Werner
Department of Neurology
RWTH Aachen University
Pauwelsstr. 30
52074 Aachen
Germany

--
____________________________________________
Thomas Nichols, PhD
Principal Research Fellow, Head of Neuroimaging Statistics
Department of Statistics & Warwick Manufacturing Group
University of Warwick
Coventry  CV4 7AL
United Kingdom

Email: [log in to unmask]
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