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Mark, disabling the extent threshold for conjunction analyses is hard (well... ;) coded in spm. I think the idea is that, if a small cluster survives the conjunction analysis, it should always be considered valid. I can see that point, but I can also see that one distrusts biologically implausibly small clusters. If you want to specify a cluster extent for a conjunction analysis, you will have to modify spm_getSPM.m (I think) where this is set somewhere near the bottom. Cheers, Marko Mark wrote: > Hi all, > > I'm using SPM5 do to a conjunction analysis of two contrasts. I'd like to show clusters with at least 100 voxels. However, in the Results panel for conjunction, after selecting "none" for "p value adjusted to," it did not ask for the setup of extent threshold. Can anyone tell me how to do it? Thanks in advance. > > Mark > -- ____________________________________________________ PD Dr. med. Marko Wilke Facharzt für Kinder- und Jugendmedizin Leiter, Experimentelle Pädiatrische Neurobildgebung Universitäts-Kinderklinik Abt. III (Neuropädiatrie) Marko Wilke, MD, PhD Pediatrician Head, Experimental Pediatric Neuroimaging University Children's Hospital Dept. III (Pediatric Neurology) Hoppe-Seyler-Str. 1 D - 72076 Tübingen, Germany Tel. +49 7071 29-83416 Fax +49 7071 29-5473 [log in to unmask] http://www.medizin.uni-tuebingen.de/kinder/epn/ ____________________________________________________