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Sean, I don't know if there is a built in utility to do that in SPM5. I have attached a Matlab script for computing ROI averages. Even if you can't get it to work on your system (it works in 5.3), you can get a sense from it about how to write your own. Eric ----- Original Message ----- From: "Sean Donnellan" <[log in to unmask]> To: <[log in to unmask]> Sent: Wednesday, July 27, 2005 11:37 AM Subject: [SPM] average activation in a ROI > Just a bit confused about how to get a result for a ROI. > > I am looking to get a value for the average activation of a ROI. I have > done my analysis on the whole of the brain and then specified a ROI in the > results section. The closest thing I have found to getting a value for the > average activation is by using the SVC tool in the results section and > giving my ROI as the image. This however seems just to give values for > clusters in that region. Is there a way to get an average activation value > for the whole ROI so I can compare this value for the same region between > subjects? > > Thanks > > Sean Donnellan > ICL