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Dear SPM (Vladimir)

I have a very basic question: if i already have condition averages at the single subject level, is it ok to convert these to images, smooth and then enter then straight into a 2nd level analysis (for which i will have defined the design/estimated the model/ defined the contrasts)?

or do i need to :
- use trial-level data
- do first-level analysis as well
?

Thank you!
z