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Hi Matt, The default option in Melodic is to use the concatenated option for running group ICA, meaning that all data that is entered is concatenated in the temporal domain and entered into a single ICA. The timeseries should therefore not just be twice as long, but N timepoints per subject * S subjects. This is appropriate for resting state data and does not generally need resolving. The timeseries output from group ICA is not typically directly used for follow-up analyses. If you want to obtain timeseries based on the group ICA components, the general recommendation is to use dual regression (https://fsl.fmrib.ox.ac.uk/fsl/fslwiki/DualRegression). Best wishes, Janine On 4 Aug 2018, at 15:29, Matt Moradi <[log in to unmask]<mailto:[log in to unmask]>> wrote: Hi! After doing gICA, the time series length is twice as long as the original input data. Why this would happen and how this can be resolved? Thanks! ######################################################################## To unsubscribe from the FSL list, click the following link: https://www.jiscmail.ac.uk/cgi-bin/webadmin?SUBED1=FSL&A=1 ----- Dr Janine Bijsterbosch Postdoctoral Researcher FMRIB Centre, University of Oxford John Radcliffe Hospital Oxford, United Kingdom [log in to unmask]<mailto:[log in to unmask]> ######################################################################## To unsubscribe from the FSL list, click the following link: https://www.jiscmail.ac.uk/cgi-bin/webadmin?SUBED1=FSL&A=1