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Hi Dear Steve, I was trying to add a confound EV. I use 3 columns files, and use cat -v check, no hidden character; use wc check, the lines of confound EV equal to the sum of the 8 original EV lines. (I have 7 task EVs and the 8th EV for scanner spikes). In the confound EV text file, all the spikes are set to 1 in 3rd column and other tasks are to 0 respectively. But the full model setting always prompt 'terminate called after throwing an instance of NEWMAT: Incompatible Dimension Exception'. Is there any mistake on my EV setting? I'll appreciate it if you have time to give a look at my timing files attached. The timing is from log file of Presentation(NBS). Thanks, Emma On Wed, Jun 10, 2009 at 3:23 PM, Steve Smith <[log in to unmask]> wrote: > Hi - it depends how the artefact is interacting with the signal of > interest. If it's very strong then if may be best to ignore that timepoint > completely, in which case you could add an extra regressor into FEAT that is > zero at all timepoints except when the spike occurs. > > Cheers. > > > > > On 9 Jun 2009, at 16:02, Emma Liang wrote: > > Dear Dr Smith, >> >> Thanks a lot. The ICA paper is very helpful. But I am a very beginer on >> signal processing methods, still need time to digest it. My current >> comprehension is that each MELODIC component is a part of original signal >> throughout the whole time serial. In my data, the scanner 'spike' noises >> affected each component and made the real activation signal very >> insignificant. I want to filter the EPI imaging by cutting all the intensity >> over 1000(machine spikes at over 2000) to 1000 and make them as a task. Is >> it ok? and is there a function to do that? Sorry if the question is too >> silly. >> >> Cheers, >> Emma >> >> On Fri, Jun 5, 2009 at 4:07 PM, Steve Smith <[log in to unmask]> wrote: >> Hi, see the FAQ: >> >> http://www.fmrib.ox.ac.uk/fslfaq/#melodic_filter >> >> Cheers. >> >> >> >> On 3 Jun 2009, at 12:42, Emma Liang wrote: >> >> Dear FSLers, >> >> I have a EPI imaging with some white noise slices throughout(about 20 of >> 500 volumes contaminated) because a unknown scanner fault. Is there any >> method to get rid of them or ignore? I'm going to make all the volumes with >> noise as a separated task, is it feasible? Thanks! >> >> Cheers, >> Emma >> >> >> >> --------------------------------------------------------------------------- >> Stephen M. Smith, Professor of Biomedical Engineering >> Associate Director, Oxford University FMRIB Centre >> >> FMRIB, JR Hospital, Headington, Oxford OX3 9DU, UK >> +44 (0) 1865 222726 (fax 222717) >> [log in to unmask] http://www.fmrib.ox.ac.uk/~steve<http://www.fmrib.ox.ac.uk/%7Esteve> >> >> --------------------------------------------------------------------------- >> >> > > --------------------------------------------------------------------------- > Stephen M. Smith, Professor of Biomedical Engineering > Associate Director, Oxford University FMRIB Centre > > FMRIB, JR Hospital, Headington, Oxford OX3 9DU, UK > +44 (0) 1865 222726 (fax 222717) > [log in to unmask] http://www.fmrib.ox.ac.uk/~steve<http://www.fmrib.ox.ac.uk/%7Esteve> > --------------------------------------------------------------------------- >