Hi Martin, thanks! -- in that region they are, but not by much
(around 75% to 80 %), as compared to the rest of the brain. It
complies fairly well with the b1 scan for that session.
Regards,
Johan
On Thu, Aug 25, 2011 at 2:47 PM, Martin Pyka
<[log in to unmask]> wrote:
> hi johan,
>
> have a look at spm_fmri_spm_ui.m (spm8) l. 430ff:
>
> %-Masking structure automatically set to 80% of mean
> %=======================================================================
> try
> TH = g.*gSF*defaults.mask.thresh;
> catch
> TH = g.*gSF*0.8;
> end
> SPM.xM = struct( 'T', ones(q,1),...
> 'TH', TH,...
> 'I', 0,...
> 'VM', {[]},...
> 'xs', struct('Masking','analysis threshold'));
>
>
> so, I suppose the signal value in your voxels are below the 80% threshold.
>
> hth
>
