Hi,
On 15 Aug 2008, at 22:45, Katie Cullen wrote:
> Hi, we are new to FSL and we have a question we did not find an
> answer in
> the previous posts.
>
> We have results from data processed with TBSS and then randomise. We
> included a threshold of 2.05 which reflected our subject number. When
> viewing our maxc tstat results in fslview, we see clusters appear. We
> understand that randomise output yields maps with values of 1-p.
> Does this
> mean that voxels that show up in flsview are voxels with a p-value
> that
> survived the thresholding?
Only if their value is greater than 0.95 (i.e. p<0.05 corrected). You
can change the Min display range to 0.95 to immediately see what
survives this.
Cheers, Steve.
> Is it still necessary, then, to change the
> thresholding on the max and min windows when viewing our results in
> fslview?
> We are concerned that this step adds an unnecessary step of additional
> thresholding that washes out our data.
>
> Thanks very much,
>
> Jazmin Camchong and Katie Cullen
>
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Stephen M. Smith, Professor of Biomedical Engineering
Associate Director, Oxford University FMRIB Centre
FMRIB, JR Hospital, Headington, Oxford OX3 9DU, UK
+44 (0) 1865 222726 (fax 222717)
[log in to unmask] http://www.fmrib.ox.ac.uk/~steve
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