Dear Wuming,
> Though there is no problem in specifying the model, however, the model
> estimation seems no working. (The sample auditary dataset works
> perfectly). A warning poped up and said "no inmask voxels - empty
> analysis". I googled this message and only found several pages
> linking to SPM source codes. Then I checked the original source code
> (cuixuprocess.m) but cannot figure out the problem.
I suspect that all you need to do is to specify a non-zero offset for
part of your volume. SPM uses a rather Q&D masking scheme to determine
what is brain and what is not, and if you only have a temporally
variable signal + noise SPM will think there is no brain anywhere and
will not complete the analysis.
I suggest you set a 26x26x32 centre square to 100, add you signal to two
voxels within that square and then add your white noise.
Good luck Jesper
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