I suppose it would be reasonable to make unsmoothed individual subject volume data available, however that isn’t going to be high on the priority list given available resources. In my opinion the smoothed volume data shouldn’t have been made available in the first place, because they were known at the time to be substantially worse than the surface-based data.
All that said, the volume timeseries are available and you can compute the volume analysis on your own to your own specifications. It doesn’t take that long: e.g. I computed 3 versions of unsmoothed volumetric task fMRI data for the purpose of evaluating structured noise clean up effects (where it is helpful to also see what is going on in the white matter and CSF) in a couple of weeks on the S500 release on a modest 5 machine compute cluster. It’s worth noting that unsmoothed volume data look quite dramatically different from smoothed data and indeed we are finding that it is the 4mm FWHM volume smoothing that is the worst offender (whereas the difference between unsmoothed volume data and surface is about the same magnitude as MSMSulc vs MSMAll) in terms of loss of spatial localization precision. On the surface smoothing is more benign in small amounts, and 4mm FWHM only modestly reduces spatial localization accuracy. Peace, Matt. From: <hcp-users-boun...@humanconnectome.org<mailto:hcp-users-boun...@humanconnectome.org>> on behalf of Ben Turner <neurobo...@gmail.com<mailto:neurobo...@gmail.com>> Date: Monday, August 21, 2017 at 7:29 PM To: "hcp-users@humanconnectome.org<mailto:hcp-users@humanconnectome.org>" <hcp-users@humanconnectome.org<mailto:hcp-users@humanconnectome.org>> Subject: [HCP-Users] Volumetric tfMRI data on ConnectomeDB Hello - I’m trying to get the volumetric cross-run analyzed task data that came with the original S500 release. I understand well the arguments for using a surface-based approach; however, I need the volume-based data for a very specific purpose. As far as I can tell, only the 2mm and 4mm grayordinate data are available currently through ConnectomeDB. Am I missing something? And if not, is there some other avenue through which I can get the volumetric data? Thanks. -Ben Turner _______________________________________________ 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
