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Hello, Thank you. Well, if I have well-understood, dual-regression allows for identification, in each subject, of the components corresponding to the group ones. But whenever I run the script, empty files are generated! Afterwards, it is necessary to buid a 4D file regrouping the individual components we are interested in, and to process intergroup comparison by randomising test: ➂ Inference: Finally, the different sets of spatial maps are collected across subjects into single 4D files (one per group-level ICA map) and analysed using nonparametric methods, e.g. permutation testing. This results in spatial maps characterising the between-subject group-consistency and/or between-subject group-differences but how to launch this test? Many thanks, Best, Christophe Selon Stephen Smith <[log in to unmask]>: > Hi - yes that is indeed the typical end-goal. For documentation please see: > http://www.fmrib.ox.ac.uk/analysis/dualreg/ > Cheers > > On 28 Dec 2011, at 05:11, christophe Habas wrote: > > > Hello, > > > > Can anyone explain me very basically and step by step what dual regression > consists in, what parameters to enter in the dual regression script, and > confirm me that after dual regression processing it is possible to process > comparison between distinct ICA groups? > > > > Thank you and sorry to insist. > > Best regards, > > Christophe > > > > > --------------------------------------------------------------------------- > Stephen M. Smith, Professor of Biomedical Engineering > Associate Director, Oxford University FMRIB Centre > > FMRIB, JR Hospital, Headington, Oxford OX3 9DU, UK > +44 (0) 1865 222726 (fax 222717) > [log in to unmask] http://www.fmrib.ox.ac.uk/~steve > --------------------------------------------------------------------------- > > > >