Hi Sebastian,
the default is that these are Z-transformed IC coefficients, i.e. it's the
standard IC maps divided by the voxel-wise residual error std-dev
(formally this is t distributed). So you're absolutely right, at every
voxels' location the value in each map shows the number of std deviations
away from the noise
hope this helps
christian
On 11 Jun 2007, at 19:38, Sebastian Moeller wrote:
Dear Christian, dear List,
I have a question regarding the values inside melodic's melodic_IC
volumes. Specifically, I have painted theses values on surfaces, and now
would like to know how to interpret those values. My assumption is, that
it is some sort of standard deviation, but what exactly. So basically my
problem is how to label the colorbar for the IC overlays? Any help would
be great.
Thanks & ahoi
Sebastian
--
Sebastian Moeller
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AG Kreiter / FB 2
Institut fuer Hirnforschung III
Abteilung Theoretische Neurobiologie
Universitaet Bremen
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____
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
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