Dear Prof. Smith,
Dear List,
one more question: would the Z-maps related to the second-last step step
(dual regression to create volumetric representations if the IC) be
available (they are not in the public release)?
This would greatly aid in interpreting/threshold the volumetric betas.
Thanks a lot in advance,
Nicola
On 07/06/2016 10:09 AM, Stephen Smith wrote:
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
<mailto:tos...@med.uniroma2.it>> wrote:
Hi,
The volumetric version!
Thanks in advance,
Nicola
-------- Original message --------
From: Stephen Smith <st...@fmrib.ox.ac.uk <mailto:st...@fmrib.ox.ac.uk>>
Date: 04/07/2016 12:37 PM (GMT+01:00)
To: Nicola Toschi <tos...@med.uniroma2.it
<mailto:tos...@med.uniroma2.it>>
Cc: hcp-users <hcp-users@humanconnectome.org
<mailto: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
<mailto: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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st...@fmrib.ox.ac.uk <mailto:st...@fmrib.ox.ac.uk>
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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 <mailto:st...@fmrib.ox.ac.uk>
http://www.fmrib.ox.ac.uk/~steve <http://www.fmrib.ox.ac.uk/%7Esteve>
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