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Hi Massih - You'll need to give some more details - is this resting state or a block/event related design? Within or across sessions? What was the command and the error when you tried the dual regression (have a look at the log files)? Various posts on this list explain how to do functional connectivity analyses using FEAT. A comparison of components from separate ICAs will generally not be valid (as the components are obtained in a probabilistic manner). Cheers, Eugene -- Eugene Duff, PhD Analysis Group, Centre for Functional MRI of the Brain (FMRIB) Nuffield Department of Clinical Neurosciences John Radcliffe Hospital University of Oxford, OX3 9DU Ph: +44 (0) 1865 222 523 -- On 20 November 2012 18:11, Massieh Moayedi <[log in to unmask]>wrote: > Hi Everyone, > > I posted this a few weeks back. Any feedback would be great. > > I have one group of subjects who performed 4 different tasks in the > scanner. The 4 tasks have a common component. How can I test whether this > component is differently connected in the 4 tasks (similar to what Dual > Regression does). I tried dual regression with an F-Test, but it didn't > run. Any suggestions? > > Thanks, Massih > >