Dear Quan,
what you are seeing is the effect of temporal filtering and whitening applied to both design and data during first level model specification and estimation. You will find the code corresponding to the "Eigenvariate" button in spm_regions.m for a reference. If you are interested in less filtered data, you may want to have a look at the "Util->Volume of Interest" tool in batch mode.
Hope this helps
Volkmar
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