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Your VOI's must be from a second level analysis. There are 122 voxels in the
VOI but these are from only 24 scans. The VOI's must be from a first level
analysis. The eigenvariate button is the correct one to use.

Darren 

> -----Original Message-----
> From: Rodolphe [mailto:[log in to unmask]] 
> Sent: Wednesday, April 02, 2008 2:35 AM
> To: d gitelman
> Subject: Re: [SPM] DCM problem
> 
> Thx for the advices, i typed these commands, No problem for 
> the spm.mat there is a sess field.
> But for my VOI i just obtained:
> xyz: [3x1 double]
>      name: 'VOI-1'
>        Ic: 0
>       def: 'sphere'
>      spec: 8
>     XYZmm: [3x122 double]
>        X0: [24x0 double]
>         y: [24x122 double]
>         u: [24x1 double]
>         v: [122x1 double]
>         s: [24x1 double]
> 
> I created them with the eigenvariate button, maybe this is a 
> mistake...
> 
> 
> 
> 2008/4/1, d gitelman <[log in to unmask]>:
> 
> 	Hi Rodolphe
> 	
> 	Please try the following.
> 	
> 	Start Matlab and spm5. At the prompt type
> 	
> 	% select the same SPM.mat file you are using
> 	% for DCM
> 	>> load(spm_select(1,'SPM.mat'))
> 	>> SPM.Sess
> 	
> 	if there is an error then the SPM.mat file is at fault.
> 	if there is no error type the following.
> 	
> 	% select each of you VOI files in turn
> 	>> load(spm_select(1,'mat'))
> 	>> xY
> 	
> 	See if there is field called Sess, then load the next 
> VOI. Based on what you
> 	are saying my guess is that one of your VOI files is 
> incorrect and does not
> 	have a Sess field.
> 	
> 	Darren
> 	
> 	
> 	
> 	
> 	
> 	> -----Original Message-----
> 	> From: Rodolphe [mailto:[log in to unmask]]
> 	> Sent: Tuesday, April 01, 2008 8:33 AM
> 	> To: d gitelman
> 	> Subject: Re: [SPM] DCM problem
> 	>
> 	> Dear Darren,
> 	>
> 	> i promise i choose a first level spm.mat.
> 	> To be sure, i created a test .mat with one run for one
> 	> subject... (click on 1st level, then specify the images and
> 	> onset, etc...then run and estimate, thats all!)And i got the
> 	> same error message.
> 	> Moreover, when i review my model, the menu indicates clearly
> 	> "Session1" and then my contrast name...
> 	>
> 	>
> 	>
> 	> 2008/4/1, d gitelman <[log in to unmask]>:
> 	>
> 	>       It appears you may be choosing the SPM.mat of a second
> 	> level model. First
> 	>       level models contain Sess fields. Please check your
> 	> SPM.mat file.
> 	>
> 	>       Darren
> 	>
> 	>
> 	>       > -----Original Message-----
> 	>       > From: SPM (Statistical Parametric Mapping)
> 	>       > [mailto:[log in to unmask]] On Behalf Of Rodolphe
> 	>       > Sent: Tuesday, April 01, 2008 7:54 AM
> 	>       > To: [log in to unmask]
> 	>       > Subject: [SPM] DCM problem
> 	>       >
> 	>       > Dear spmers,
> 	>       >
> 	>       > In order to do a dcm analysis, i click on the 
> dcm button
> 	>       > (With the last version of smp5) then i 
> specify my 1st level
> 	>       > spm.mat (for 1 subject), i specify a name for 
> the dcm matrix,
> 	>       > i give some vois and then matlab write the following
> 	> error message :
> 	>       >
> 	>       > ??? Reference to non-existent field 'Sess'.
> 	>       >
> 	>       > Error in ==> spm_dcm_ui at 136
> 	>       >     Sess   = SPM.Sess(xY(1).Sess);
> 	>       >
> 	>       > ??? Error using ==> spm_dcm_ui
> 	>       > Reference to non-existent field 'Sess'.
> 	>       >
> 	>       > ??? Error while evaluating uicontrol Callback
> 	>       >
> 	>       > I tried to find the problem without success, 
> the dcm tutorial
> 	>       > works fine but i cant see whats the 
> difference with my data...
> 	>       >
> 	>       > Thx,
> 	>       >
> 	>       > rodolphe
> 	>       >
> 	>       >
> 	>
> 	>
> 	>
> 	>
> 	>
> 	>
> 	
> 	
> 	
> 
> 
>