There are few circumstances that one should do unconstrained smoothing in the volume.
Peace, Matt. On 1/3/18, 12:53 PM, "[email protected] on behalf of Tobias Bachmann" <[email protected] on behalf of [email protected]> wrote: >Hi Stephen, > >Am Mittwoch, 3. Januar 2018, 16:02:06 CET schrieb Stephen Smith: >> > On 3 Jan 2018, at 14:44, Tobias Bachmann >> > <[email protected]> wrote: >> > 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? > >Spatial. > >> 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. > >I'm indeed planning on using dual regression later on. > >> > 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. > >Okay, thanks a lot! > >Tobias > > >_______________________________________________ >HCP-Users mailing list >[email protected] >http://lists.humanconnectome.org/mailman/listinfo/hcp-users _______________________________________________ HCP-Users mailing list [email protected] http://lists.humanconnectome.org/mailman/listinfo/hcp-users
