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Hi, On 30 Apr 2007, at 08:54, Xuelin Cui wrote: > hi folks: > > I ran MELODIC for fMRI data, and thus have a bunch of independent > components which are displayed by a html file. In the html file, > there is a spatial map, a time course, as well as a Fourier > spectrum of the time course. > > I have some questions on those in the html file: > > 1. Are all the spatial maps in single html file snapped at > different time point? IF so what time are they? > No > 2. What is the relation between the time course and the spatial map > in the same html file? > They express the spatial and temporal characteristics of a component - in a similar way that EVs (regressors in the GLM) and the associated maps of parameter estimates express BOLD modulation. That is, the spatial maps corresponds to a map of parameter estimates and the time course describes how that spatial map is modulated in strength at different time points. > 3. Are the 125 points time course variance corresponds to a certain > voxel in the brain? If so, which voxel is it? If not, what is it > related to? Some certain region? > Likewise, the time course is related to the entire IC map - not to a single voxel. cheers christian > Thanks a lot > > Xuelin > > **************************************** > Xuelin Cui > Department of Electrical Engineering > University of Hawaii-Manoa > Honolulu HI 96822 > > Tel: 1-808-349-0983 > Email: [log in to unmask] > **************************************** ____ 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