HCP processing does not conduct low-pass filtering for either minimally preprocessed or FIX-cleaned data. However, low pass temporal filtering is probably not necessary, and is not recommended by the HCP consortium.
One goal of FIX is to selectively remove high frequency noise, but keep other high frequency sources that are more likely to be signal. The FIX-ICA denoising identifies and removes components containing high frequencies, but also requiring signatures of noise. Most in the HCP consortium argue that this is preferable to filtering potential signal, and preferable to using low pass temporal filters that can smooth the data and run the risk of artifactually inflating connectivity estimates. --Greg ____________________________________________________________________ Greg Burgess, Ph.D. Staff Scientist, Human Connectome Project Washington University School of Medicine Department of Psychiatry Phone: 314-362-7864 Email: [email protected] > On Nov 4, 2016, at 1:48 PM, nailin yao <[email protected]> wrote: > > Hi , > > I'm trying to do analysis on the resting fMRI output from HCP-Pipeline and > ICAFIX. May I know if these preprocessing include low-pass filtering (with > .01~0.1Hz signal left for resting analyzing)? Or I need to do it separately? > Thank you very much! > > Best, > Nailin > > -- > Nailin Yao, PhD > > Postdoctoral Associate > Department of Psychiatry, Yale University > > _______________________________________________ > HCP-Users mailing list > [email protected] > http://lists.humanconnectome.org/mailman/listinfo/hcp-users > ________________________________ The materials in this message are private and may contain Protected Healthcare Information or other information of a sensitive nature. If you are not the intended recipient, be advised that any unauthorized use, disclosure, copying or the taking of any action in reliance on the contents of this information is strictly prohibited. If you have received this email in error, please immediately notify the sender via telephone or return mail. _______________________________________________ HCP-Users mailing list [email protected] http://lists.humanconnectome.org/mailman/listinfo/hcp-users
