This is a known old bug. update your SPM installation.
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Darren Gitelman, MD
sent from my iPhone
On Jun 4, 2009, at 6:50 AM, Richard Binney
<[log in to unmask]> wrote:
> Hi,
>
> I have previously run FMRI anlyses and not had any such problems,
> but during my latest analysis SPM5 is behaving strangely.
>
> I'm currently specifying and estimating at the the first level
> (fixed single subject level). When reviewing the design matrices
> follwioing specification, everything looked fine. However, after
> estimation a few things have gone wrong:
>
> 1) Having previously estimated about 13 datasets, I specfied and
> estimated 4 newly acquired datasets. 2 strange things occurred: a)
> the SPM.mat file of a previously estimated dataset was overwritten
> so that in 'review' this SPM.mat file showed the design matrix (and
> associated images) of one of the newly estimated datasets; and b)
> the design matrix of some datasets exhibited a grey colour in the
> column for the constant while the majority were pure white as I
> would expect. In other cases this column had soft grating (see
> attached image). This was despite the fact that each particpant's
> design was specified using the exact same batch file.
>
> 2) In response to this, and to check it wasn't an error on my part
> (e.g. mixing file associations), I deleted all the first level
> analyses and completely re-specified and re-estimated all the
> datasets. While the SPM.mat files seemed to have the correct
> associated files, the variance in the colour of the constant column
> (which was always pure white prior to estimation) got more severe
> than before.
>
> 3) I have also previously attempted to run two different group-level
> (random effects) analyses with this data a onesample t-test and a
> two sample t-test. This had a similar effect of mixing up
> associated SPM.mat and individual contrast files.
>
> Can anyone tell me what is normal, what is not and what might be
> going on?
>
> HELP!!
>
> Thanks
>
> Richard
> <strangedesignmatrix.jpg>
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