Hi,
I want to extract time series in a sphere centered at a voxel for PPI analysis in SPM8. I followed the example data ("attention") in spm8 manual. In that example, while extracting time series in a voxel, I got to press "eigenvariate" and later it would ask "Adjust data for." Every step was perfectly done.
However, when I tried that in my data, after pressing "eigenvariate," it did not ask "Adjust data for" but automatically showed "don't adjust." Does anyone know why?
My fmri data underwent realignment, coregistration to T1, normalization to template, smoothness, and then model specification and estimation with contrasts set.
Thanks.
Mark
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