Hi,
For PPI analysis in spm8, we have to input the time series of a seed region. I know spm8 itself can extract time series (by pressing "eigenvariate"). However, in all my subjects, I already have their time series data in a ROI extracted by MarsBar (select SPM.mat --> "Data" --> "Extract ROI data (default)" --> Select my ROI mask --> "Data" --> Export the time series data), which were saved as VOI-ROI.mat file (it seems that files containing time series that can be selected as input in PPI must have a name initiating with "VOI").
Can I use this MarsBar-produced time series (i.e. VOI-ROI.mat) as VOI input in PPI batch module in spm8? Or, the time series must be "eigenvariate" data? (However, eigenvariate time series of my fmri data are in U-shape, with an extremely large the very first and very last number).
Thanks.
Mark
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