Dear SPM experts,
Now I would like to extract time series from ROI with spm_regions.m, however, I got different time series if I supplied the code "spm_get_data" with SPM.xY.P and SPM.xY.VY. May I ask what's the difference between SPM.xY.P and SPM.xY.VY? I have checked that the time series from 'SPM.xY.P' were the raw pre-processed data, while the scale of the time series from 'SPM.xY.VY' were smaller.
Another question is what the SPM.xX.xKXs.X is? I found an explanation that it is the matrix of trials and betas (columns) in each trial. What's the difference between SPM.xX.xKXs.X and the raw design matrix SPM.xX.X? How could I calculate the SPM.xX.xKXs.X based on the SPM.xX.X. Any suggestions would be greatly appreciated.
Best regards,
Lizhi
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