Thank you Steve and Giles. Giles: I believe the pdf specified that dual regression 1 results are in /ts2 and eigentimeseries results are in /ts3, isn't it?
Steve: I am confused here. I am using nifti data converted from cifti, which means that the first 91282 "voxels" of my nifti matches the 91282 grayordinates in the cifti files. The two methods should be identical because they have exactly the same info, only different shapes of matrices. Isn't wb_command -cifti-convert -to-nifti the recommended way to use FSL commands on cifti data and isn't it supposed to give identical results as working with cifti directly? Best, Cherry On Fri, Jul 31, 2015 at 10:04 AM, Giles Colclough <giles.colclo...@gmail.com > wrote: > Hi, Cherry, > > Have a look at the other nodetimeseries data. > The ts2 time series are estimated using the eigen-timeseries method. ts1 > are calculated using traditional dual regression. > > A fuller explanation is in the pdf available in the netmats download: > > > Node timeseries (individual subjects) > > For a given “parcellation” (group-ICA decomposition), the set of ICA > spatial maps was mapped onto each subject's rfMRI timeseries data to derive > one representative timeseries per ICA component (for these purposes we > consider each ICA component as a network "node"). For each subject, these > 25 (or 50, 100, 200 or 300) timeseries can then be used in network > analyses, as described below. Two distinct methods were used to estimate > the node-timeseries: > > 1. > > The more traditional "dual-regression stage-1" approach, in which the > full set of ICA maps was used as spatial regressors against the full data, > estimating one timeseries for each ICA map [Filippini 2009]. > 2. > > A newer approach based on estimating the principal eigen-timeseries > within each ICA component; this approach aims to be more robust against > component misalignment (between the group-ICA maps and individual subjects' > data) and artifacts [O’Reilly 2009, Smith OHBM 2014]. > > > > Best, > Giles > > > > On 31 Jul 2015, at 15:50, Yizhou Ma <maxxx...@umn.edu> wrote: > > Dear HCP experts, > > I am trying to run my own dual regression on HCP's rsfMRI data. What I did > is use wb_command -cifti-convert -to-nifti to convert group ICA maps and > individual rsfMRI scans to NifTI and use FSL's dual_regression command. > > *dual_regression melodic_IC.nii.gz 1 -1 0 ./test 100307_rsfMRI.nii.gz* > > I was able to get dual regression results. Yet the dual regression 1 > results I get does not match up with the nodetimeseries ts2 results > provided in HCP's PTN release. I have opened my group ICA maps and rsfMRI > scan in matlab to ensure that the values in them match up with the cifti > files. I have tried dual regression with another subject but still the > results did not match. > > Do anyone have an idea what might have gone wrong? > > Thank you very much, > Cherry > > _______________________________________________ > HCP-Users mailing list > 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
