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Does this still happen if you install the updates?  See 
http://www.fil.ion.ucl.ac.uk/spm/software/spm5/#Bugs for more info.

Best regards,
-John

On Tuesday 23 September 2008 16:36, Marc Dubin wrote:
> Dear SPM Users,
> Am new to SPM. Tried running the slover visualisation function on matlab
> 7.5/SPM5/Leopard and got the following error when trying slover('basic_ui')
>
> >> slover('basic_ui')
>
> Warning: FINITE is obsolete and will be removed in future versions. Use
> ISFINITE instead.
>
> > In spm_select>selector at 113
>
>   In spm_select at 97
>   In @slover/private/pr_basic_ui at 17
>   In slover.slover at 208
> ??? Undefined function or variable "hor_max".
>
> Error in ==> spm_select>selector at 157
>     Rect(1) = (hor_max - 0.5*hor_width) - 0.5*Rect(3); % Horizontal
>
> Error in ==> spm_select at 97
>     [t,sts] = selector(varargin{:});
>
> Error in ==> pr_basic_ui at 17
>   imgs = spm_select(Inf, 'image', 'Image(s) to display');
>
> Error in ==> slover.slover at 208
>     o = pr_basic_ui(others, varargin{:});
>
> Any thoughts on what might be going on here would be most appreciated!
>
> Best,
> Marc
>
> On Tue, Sep 23, 2008 at 9:19 AM, Vlad Kushnir <[log in to unmask]> wrote:
> > Hello,
> >
> >
> >
> > I have encountered a problem and would greatly appreciate some direction
> > in resolving it.
> >
> >
> > In my study design there are two drug conditions, Pre and Post-drug
> > scans. During each scan subjects are presented with a task that shows
> > drug-related and neutral cues, as well as a rest fixation cross in a
> > blocked design. As I have
> > one subject group and the subjects vary in their level of tobacco
> > dependence
> > (TD), my goal is to create a model that examines how TD influences
> > differential activation between the two scan sessions. Therefore, in
> > essence I
> > would like to create a paired-samples t-test with TD as a covariate of
> > interest.
> >
> >
> > So far I have tried the following:
> >
> > To best look at how drug cues elicit brain activation in my population of
> > interest, for every subject during each of the two scans, I have created
> > a 1st
> > level drug cue > neutral cue contrast. These contrasts were later taken
> > into a
> > 2nd level paired t-test design (with TD as a covariate for each pair),
> > however
> > the job would not compute. I'm wondering if there is a way to look at the
> > effect of TD on the difference between the two scans, or as a covariate
> > of interest.
> >
> > Then I tried creating a full factorial design with one factor (Drug) that
> > has two
> > levels (pre and post). There was no independence between the two levels.
> > TD was the covariate, but it was entered twice repeatedly, once for the
> > pre-drug
> > level and once for the post-drug. I am not sure if this is the most
> > appropriate
> > design.
> >
> > In an alternative method, I took every subject's pre and post drug scans
> > into
> > 1st level and created a drug cue pre > drug cue post (and vice versa)
> > contrast. I then took these contrast images into a 2nd level multiple
> > regression
> > analysis, where TD was the covariate. I am also not sure if this is the
> > most
> > appropriate design, especially since neutral cues are not taken into
> > context.
> >
> > Please advise.
> >
> > Thank you in advance,
> >
> > Vlad Kushnir