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Hi - you should do this as a contrast between the variables, to be setup *before* running randomise - see the randomise and GLM pages on the FSL wiki. Cheers, Steve. > On 4 Nov 2015, at 21:15, Rachel Steiner <[log in to unmask]> wrote: > > Hi FSL, > > We have two tbss maps, each correlated with a behavioral variable, and I'd like to know if there is a way to compare those maps to reveal regions of statistical difference between the two? In other words I want to see regions in which the correlation is stronger for one variable relative to the other? > > Thank you for your help, > > Rachel --------------------------------------------------------------------------- Stephen M. Smith, Professor of Biomedical Engineering Head of Analysis, 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 <http://www.fmrib.ox.ac.uk/~steve> --------------------------------------------------------------------------- Stop the cultural destruction of Tibet <http://smithinks.net/>