Great, thanks a lot,
Nicola
-------- Original message --------
From: Stephen Smith <st...@fmrib.ox.ac.uk>
Date: 06/07/2016 10:09 AM (GMT+01:00)
To: Nicola Toschi <tos...@med.uniroma2.it>
Cc: hcp-users <hcp-users@humanconnectome.org>
Subject: Re: [HCP-Users] Exact Meaning of ICA maps in 800 subjects release
Hi
Group-ICA is carried out in grayordinate space. Then:
For each subject, subject-wise grayordinate AND volumetric maps (versions of
the group-ICA) are estimated using dual-regression, with node-timeseries
normalisation, and outputs in units of GLM betas (parameter estimates) not Z.
These volumetric maps are then averaged across subjects to generate the
group-average volumetric maps distributed from HCP.
So how you threshold these is up to you and depends what the intended usage for
that is.......
Cheers.
On 6 Jul 2016, at 07:26, Nicola Toschi <tos...@med.uniroma2.it> wrote:
Hi,
The volumetric version!
Thanks in advance,
Nicola
-------- Original message --------
From: Stephen Smith <st...@fmrib.ox.ac.uk>
Date: 04/07/2016 12:37 PM (GMT+01:00)
To: Nicola Toschi <tos...@med.uniroma2.it>
Cc: hcp-users <hcp-users@humanconnectome.org>
Subject: Re: [HCP-Users] Exact Meaning of ICA maps in 800 subjects release
HI - do you mean the grayordinate or volumetric versions? Cheers
On 4 Jul 2016, at 11:16, Nicola Toschi <tos...@med.uniroma2.it> wrote:
Hi list,
This may be more of a MELODIC question, but I would be grateful for any input:
In the ICA release on 800+ subjects, what is the exact mathematical meaning /
definition of the (non-binary) intensities of the different component volumes?
Are they easily relatable to a statistical map (I am looking to threshold them
to study main clusters and possibly correct for multiple comparisons)?
Thanks in advance,
Nicola
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Stephen M. Smith, Professor of Biomedical Engineering
Head of Analysis, Oxford University FMRIB Centre
FMRIB, JR Hospital, Headington, Oxford OX3 9DU, UK
+44 (0) 1865 222726 (fax 222717)
st...@fmrib.ox.ac.uk http://www.fmrib.ox.ac.uk/~steve
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Stop the cultural destruction of Tibet
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Stephen M. Smith, Professor of Biomedical Engineering
Head of Analysis, Oxford University FMRIB Centre
FMRIB, JR Hospital, Headington, Oxford OX3 9DU, UK
+44 (0) 1865 222726 (fax 222717)
st...@fmrib.ox.ac.uk http://www.fmrib.ox.ac.uk/~steve
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Stop the cultural destruction of Tibet
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