Hi,
On 14 Sep 2009, at 14:12, cliff wrote:
> hi,
> after i finished MELODIC analysi, how can i identify the default
> mode network(i just analyze a group of resting state data) from
> those compoents?
I assume you used MELODIC in 'concat' multi-subject mode?
> if there any method in MELODIC to mask or sort the components
> spatially / temporallly? just as the GIFT(Group ICA of FMRI toolbox,
> vince calhoun).
The components are sorted according to % variance explained, which is
often not very informative. If you want to identify the default mode
network - hopefully if your dimensionality was not too high, it should
be pretty obvious from the group-ICA spatial maps - otherwise you
could look at certain classic ACC/PCC seed points to see which
components are highest in those areas. The most robust automated
thing to do would be 'template matching' or correlation against a pre-
defined DMN map - though I'm not aware of a publicly-available one of
those currently (we'll be releasing this kind of thing at some point
soonish as one of the atlases provided with FSL).
Cheers.
>
>
> --
> Best regards!
>
> Sen-Hua Zhu
> Department of Psychology
> Sun Yat-sen University
> 135 Xingang West Road, Haizhu District, Guangzhou (510275), P.R.China
> 朱森华
> 中山大学心理学系
> 广东省广州市海珠区新港西路135号(510275)
>
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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
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