It’s better to remove structured noise with ICA-based techniques, and we really essentially are only detrending HCP data. For unstructured noise, this will not affect regression-based analyses much, but will affect correlation analyses. I’d recommend parcellating your data to reduce unstructured noise. Temporal filtering will remove higher frequency BOLD signal.
Matt. From: <hcp-users-boun...@humanconnectome.org<mailto:hcp-users-boun...@humanconnectome.org>> on behalf of Anita Sinha <amsi...@wisc.edu<mailto:amsi...@wisc.edu>> Date: Wednesday, February 6, 2019 at 2:43 PM To: Steve Smith <st...@fmrib.ox.ac.uk<mailto:st...@fmrib.ox.ac.uk>> Cc: "hcp-users@humanconnectome.org<mailto:hcp-users@humanconnectome.org>" <HCP-Users@humanconnectome.org<mailto:HCP-Users@humanconnectome.org>> Subject: Re: [HCP-Users] Bandpass filtering ICA-FIX resting data Others in the literature have looked into how slow-4 (0.027-0.073 Hz) and slow-5 (0.01-0.027 Hz) oscillations in rs-fMRI data change between populations. Would you then recommend that unless we are looking at specific frequency bins within resting-state, we should not bandpass filter the rs-fMRI data that has gone through ICA-FIX? ________________________________ From: Steve Smith <st...@fmrib.ox.ac.uk<mailto:st...@fmrib.ox.ac.uk>> Sent: Wednesday, February 6, 2019 12:34:55 PM To: Anita Sinha Cc: hcp-users@humanconnectome.org<mailto:hcp-users@humanconnectome.org> Subject: Re: [HCP-Users] Bandpass filtering ICA-FIX resting data Hi On 6 Feb 2019, at 18:08, Anita Sinha <amsi...@wisc.edu<mailto:amsi...@wisc.edu>> wrote: To Whom It May Concern, I am interested in using ICA-FIX resting-fMRI data from HCP. Given that ICA-FIX functions to denoise the data by removing high frequency noise, It's not explicitly doing this. The pre-filtering removes just the *very* lowest frequencies. But yes in practice FIX will remove a lot of high frequency components if they are deemed artefact. do you recommend bandpass filtering the rs-fMRI data (0.01- 0.1 Hz) that has already gone through ICA-FIX before running any analysis? No - I would almost never recommend doing lowpass filtering (removing high frequency signal). Cheers. Thank you for your time. I look forward to hearing from you soon. Regards, Anita _______________________________________________ HCP-Users mailing list HCP-Users@humanconnectome.org<mailto:HCP-Users@humanconnectome.org> http://lists.humanconnectome.org/mailman/listinfo/hcp-users --------------------------------------------------------------------------- Stephen M. Smith, Professor of Biomedical Engineering Head of Analysis, WIN (FMRIB) Oxford FMRIB, JR Hospital, Headington, Oxford OX3 9DU, UK +44 (0) 1865 610470 st...@fmrib.ox.ac.uk<mailto:st...@fmrib.ox.ac.uk> http://www.fmrib.ox.ac.uk/~steve --------------------------------------------------------------------------- Stop the cultural destruction of Tibet<http://smithinks.net> _______________________________________________ HCP-Users mailing list HCP-Users@humanconnectome.org<mailto:HCP-Users@humanconnectome.org> 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 HCP-Users@humanconnectome.org http://lists.humanconnectome.org/mailman/listinfo/hcp-users
