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Hi - I'm not sure why you would want to form that as a 4D dataset, as it would be an outer product of a timecourse with a spatial map…..all the variance information you need can be summarised by the 3D stats images and the model timecourse. Cheers. On 25 Oct 2011, at 17:38, Sean McWhinney wrote: > Hello FSL pros, > > I'm attempting to compare the variance of functional data that is a) related to and b) unrelated to, my model, within an ROI. For activity unrelated to my model, I've used res4d, which should suit this (but please correct me if I'm wrong). For activity related to the model, I'd intended to use cope1, but this is apparently only three dimensional, not four. Is there some way of looking at a participant's functional data that is only related to the model over time? > > Thanks in advance, > Sean > --------------------------------------------------------------------------- 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 ---------------------------------------------------------------------------