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I've noticed that letting MELODIC estimate the number of components somewhat decreases the amount of noise found in resting-state networks. It also seems to break some RSNs into multiple components. We had been selecting 30 components but with the automatic dim estimate the numbers are in the 40-50 range (depending ususally on how much motion there is). Thanks. -Pete > Hi, > > no, it does not matter if some inputs have different number of > components. I always think that the automatic dim estimate is what > should be used - are numbers very much hgher than 30? > cheers > c > > > On 11 Jul 2007, at 21:05, Peter Fried wrote: > >> Hi All, >> >> If I am merging the Melodic outputs for multiple subjects in order to >> rerun Melodic, do all the inputs have to have the same number of >> components? >> >> I am trying to decide between choosing 30 components for each >> subject (180 >> volumes, TR=2.0) or letting Melodic estimate the number. >> >> Thanks. >> >> -Pete > > ____ > Christian F. Beckmann > University Research Lecturer > Oxford University Centre for Functional MRI of the Brain (FMRIB) > John Radcliffe Hospital, Headington, Oxford OX3 9DU, UK. > [log in to unmask] http://www.fmrib.ox.ac.uk/~beckmann > tel: +44 1865 222551 fax: +44 1865 222717 >