Dear SPM experts,
I met an analysis problem in the random effect of one of my experimental
conditions with SPM5. The activation is made up of many separated tiny dots,
rather than one or several big blobs (see the attachment). This is the only
problematic case among all my experimental contrasts within the same model.
Here is some further information,
The problematic contrast:
FWHM = 1.6 1.6 1.5 mm mm mm; 0.8 0.8 0.8 {voxels};
Volume: 1379328; 172416 voxels; 337791.5 resels
Voxel size: 2.0 2.0 2.0 mm mm mm; (resel = 0.47 voxels)
One of the normal contrasts:
FWHM = 12.5 12.9 12.2 mm mm mm; 6.3 6.4 6.1 {voxels};
Volume: 1379328; 172416 voxels; 649.0 resels
Voxel size: 2.0 2.0 2.0 mm mm mm; (resel = 246.41 voxels)
I checked the fixed effect of this specific contrast for each subject, but
did not find any similar "dot" problem. I feel puzzled with it. Could
anybody be kind to give me a hint on the reason and possible solution? Any
help is greatly appreciated!
Cheers,
Jie
