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I am new to creating and overlaying masks and am wondering the following... Is there a function in SPM99 that allows you to overlay masks by adding them together so that specific areas of activation where varying numbers of subjects overlap are represented by different colors? For example, the mask would indicate activation from one subject in an area that is represented in blue (value of 1), overlapping areas of activations between that subject and another subject, totaling to two subjects, is represented in red (value of 2), overlapping areas of activations between those two subjects and a third, totaling to three subjects, is represented in yellow (value of 3), etc. I created ROI masks in marsbar but can not find an equation that outputs a mask that indicates where activations, across any given number of subjects, overlap and do not overlap within the region of interest. Any advice or guidance would be greatly appreciated. Thanks, Siobhan Hoscheidt