Mohamed -
The plotted timecourse for standard temporal concatenation is the
first eigenvector across all subjects - not particularly informative
for resting state data. I *believe* that the powerspectrum shown is
taken from this. You would need to combine the individual subject
power spectra to gain an estimate of the group average spectra.
Best,
Eugene
--
Centre for Functional MRI of the Brain (FMRIB) | University of Oxford
John Radcliffe Hospital | Headington
OX3 9DU | Oxford | UK
Ph: +44 (0) 1865 222 523 | Mob: +44 (0) 7946 362 059 | Fax: +44 (0) 1865 222 717
--
On 31 December 2010 14:17, Mohamed Bahri <[log in to unmask]> wrote:
> Dear FSL experts,
>
> The power spectrum of the timecourse of the DMN component issued from an ICA multi-session temporal concatenation analysis (21 subjects) showed to have more contribution in high frequency (see attached files) which is confusing for me (as the neuronal contribution is mostly low frequency). Could anyone have a look on these results? I probably missed something.
>
> With the best,
>
> Mohamed
|