Hello Chiara,
the VOI function should do the job, actually, so I am not sure why it is
not working.
First, display a contrast via the RESULT function, then position the cursor
in the glass brain
on the cluster you want to extract.
Then, use the VOI function, select one of the options "box", "sphere",
"cluster", and
you will get a printout of the - in your case - 300 raw values.
In the header of the function spm_regions.m the output variables are
explained.
What you probably need is the xY.s values, that is the volumes of the
(smoothed) images,
that can be used for additional statistics.
Is this answering your question?
Philipp
Header of the spm_region.m script (SPM5 version):
% xY - VOI structure
% xY.xyz - centre of VOI {mm}
%
xY.name - name of VOI
% xY.Ic - contrast used to
adjust data (0 - no adjustment)
% xY.Sess - session index
%
xY.def - VOI definition
% xY.spec - VOI
definition parameters
% xY.XYZmm - Co-ordinates of VOI voxels
{mm}
% xY.y - [whitened and filtered] voxel-wise data
%
xY.u - first eigenvariate {scaled - c.f. mean response}
%
xY.v - first eigenimage
% xY.s -
eigenvalues
% xY.X0 - [whitened] confounds (including drift
terms)
%
% Y and xY are also saved in VOI_*.mat in the SPM working directory
Max Planck Institute of Psychiatry
NMR Research Group
Kraepelinsr. 2-10
80804 Munich
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Phone: 0049-89-30622-413
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