1. I would avoid this. 2. The cleaned data do have some of this artifact removed.
Peace, Matt. From: <hcp-users-boun...@humanconnectome.org<mailto:hcp-users-boun...@humanconnectome.org>> on behalf of Stephen Smith <st...@fmrib.ox.ac.uk<mailto:st...@fmrib.ox.ac.uk>> Date: Wednesday, January 3, 2018 at 9:02 AM To: Tobias Bachmann <tobias.bachm...@studserv.uni-leipzig.de<mailto:tobias.bachm...@studserv.uni-leipzig.de>> Cc: "hcp-users@humanconnectome.org<mailto:hcp-users@humanconnectome.org>" <hcp-users@humanconnectome.org<mailto:hcp-users@humanconnectome.org>> Subject: Re: [HCP-Users] Smoothing, discarding volumes Hi On 3 Jan 2018, at 14:44, Tobias Bachmann <tobias.bachm...@studserv.uni-leipzig.de<mailto:tobias.bachm...@studserv.uni-leipzig.de>> wrote: Dear all, when using the HCP's ICA+FIX data (NIfTI volume files) for a rather simple group ICA, would you recommend further conventional preprocessing, i.e. 1. smoothing (about which conflicting info is to be found) spatial or temporal? The simple answer is in general no, although for the purposes of group-ICA only (and not any later subject-specific analyses like dual regression), it might be the case that some lowpass temporal filtering could boost effective CNR. 2. discarding the first few volumes (I found hardly anything regarding this issue)? For most purposes it's not necessary, though there are some slight residual starting effects in the data, so you could delete a few. Cheers. Kind regards, Tobias Bachmann _______________________________________________ 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, Oxford University FMRIB Centre FMRIB, JR Hospital, Headington, Oxford OX3 9DU, UK +44 (0) 1865 222726 (fax 222717) 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 _______________________________________________ HCP-Users mailing list HCP-Users@humanconnectome.org http://lists.humanconnectome.org/mailman/listinfo/hcp-users
