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Hi - I just tested this here and it does give the same answer in both cases - are you sure that you're NOT using the (Z>0) option? Cheers, Steve. On Tue, 23 Aug 2005, Chris Kelly wrote: > Hi, > > I'm running post-contrast masking on a higher level analysis. I would expect that, if I masked > contrast A with contrast B, I would get the same result as if I did it the other way around (mask B with > A), but I don't. I'm wondering why there seems to be directionality when doing conjugations. Is it an > issue of the voxel corrections? > > Thanks, > Chris Kelly > fMRI Center, Columbia University > -- Stephen M. Smith DPhil Associate Director, FMRIB and Analysis Research Coordinator Oxford University Centre for Functional MRI of the Brain John Radcliffe Hospital, Headington, Oxford OX3 9DU, UK +44 (0) 1865 222726 (fax 222717) [log in to unmask] http://www.fmrib.ox.ac.uk/~steve