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Hello, I'm trying to use the Image Calculator built into SPM 5 to mask voxels below a certain threshold. As recommended in the SPM 5 manual, I used the ImCalc to create a binary mask of the image (i1>threshold) and multiplied that times the original image ( i1.*(i1>threshold)). Insignificant voxels should get multiplied by 0 in this case, but when I view the resulting, masked image in software like mricro, all the below threshold voxels are still present. Has anyone had a similar problem? Am I using the calculator incorrectly? Thanks in advance for your help? -eric Eric H. Schumacher, Ph.D. School of Psychology Georgia Institute of Technology 654 Cherry Street Atlanta, GA 30332-0170 phone: 404-894-6067 lab: 404-385-7056 fax: 404-894-8905 email: [log in to unmask] website: www.psychology.gatech.edu/CoNTRoL