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Hmm, don't know if there's a tool for that, sorry. Maybe you want the avwmaths++ -bptf option? I have never used it myself so cannot help you with it, but btpf stands for bandpass temporal filtering. From the help (which you get by just calling avwmaths++) it looks like a sharp cutoff in frequency. That gives you a temporal response which is quite smeared out. hth Alle Meije Jason Steffener wrote: > Hello. Thank you for the reply. I am interested in only temporal filtering. > Yes the methods you describe all make sense. I do not need an "ideal" filter > just an imporved one. By a higher-order (or higher-taps) filter I am > refering to one that will use more time points and have the ability to > provide a sharper cutoff (a smaller transition band). And it is this smaller > transition band that I am most interested in. I know that I can do this in > MatLab easily enough. However, I am interested in streamlining things so it > would be ideal to have an improved filter in FSL. > > Thank you, > Jason.