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Dear FSLlist, I have been trying to use the filter option to remove noise from my data and I am wondering how exactly the function works. I thought that the filter function was merely removing the specified components from the mixing matrix and rebuilding the data sans those components. Just to see what would happen, I filtered 25 of the 50 components generated from a 200 image dataset, melodic -i data.hdr -v -o filtered_data.ica --mix=melodic_mix -f "2,3,.." and then performed a melodic ICA on the filtered_data.img that is created. I expected to get the 25 remaining components only, but instead still got close to 50 components. Clearly there is something about this process that I do not understand. Thanks for the help! Tim