Dear SPMers,
I have a question about "VOI" button in SPM2:
I want to extract the time course of a single voxel, so I selected the "don't adjust" and "sphere"(radius 0). To my knowledge, the raw time course of the given voxel would be obtained by such selections, but I found the extracted time course (the variable Y in VOI_???.mat) seems to be wrong: there exists a steep decrease in the first scans and a steep increse in the last scans. Such time course is obviously not same as the raw data.
Why did I get the "wrong" time course by such selections?
Any suggestions would be appreciated!
Meng Liang
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2005-04-08
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