Hi all, we were wondering whether anyone can help us figure out this little
problem we have.
We are trying to run SPM on a simulated data set, which contains voxels
with gaussian noise and several actived voxels with an ideal hemodynamic
response. The dynamic range of data values is between 0 and 32767.
Whenever we apply fMRI model on the data set in SPM99, it gives us the
following error messages:
-----------------------------------------------------------------------
Warning: No inmask voxels - empty analysis!
> In /home/wilkin/spm_spm.m at line 1076
In /software/spm99/spm_fmri_spm_ui.m at line 619
Design parameters : ...intrinsic autocorrelation
Warning: Divide by zero.
-----------------------------------------------------------------------
We have tried several different setting and still get the same error. It
appears that SPM99 applies some kind of scaling during the preprocessing
steps. As the results, there is not voxel survive from the masking
operation done by the script of "spm_spm.m".
any suggestions of what can be causing this problem?
thanks a lot
Wilkin Chau
Valeria Della Maggiore
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