Hi Gabor,
I actually don't know, but I think Anastasia has a fix for the thresholding
issue.
cheers
Bruce
On Wed, 11 Jul 2012, Gabor Perlaki wrote:
Dear Bruce,
Did you also identified a strong rightward asymmetry (with pars triangular
and BA44) in your data analyzed by freesurfer 5.1? Just, to be sure, that
this is not an issue only with our data. I'd like to use the TRACULA as
well, and because tracula uses the cortical parcellation of our subjects I'm
not sure that it is worth to start TRACULA now, or waiting for your cortical
parcellation fix.
Sorry for disturbing you again with the same issue, but it is very important
for us to know, that it is a real issue with the cortical parcellation or we
messed up something, and if it is a real issue, which labels we shouldn't
use for statistical analysis.
Thank you in advance for your answer,
Gabor
2012/6/25 Bruce Fischl <fis...@nmr.mgh.harvard.edu>
sure. Thanks for pointing out the BA44 issue. We'll put
together a fix in the next couple of weeks
Bruce
On Mon, 25 Jun 2012, Gabor Perlaki wrote:
Dear Bruce,
I've checked the pars triangularis. It was
right-lateralized in 79 subjects
and left-lateralized in only 19 subjects.
Thanks, Gabor
2012/6/23 Bruce Fischl <fis...@nmr.mgh.harvard.edu>
the structures don't need a threshold. Do you
know that pars
triangularis is left lateralized? For the BAs
will get you a
solution
On Sat, 23 Jun 2012, Gabor Perlaki wrote:
Dear Bruce,
We don't used any thresholding by
ourselves, we just
took BA44 volumes out
of the text-file in the stats directory.
Should we use thresholded values instead
of the
volumes reported by the text
files in the stats directory?
Could we use the volumes reported by the
aparc.stats
and aseg.stats files
for any statistical analyses, or do we
need
threshold that structures as
well?
Thanks,
Gabor
2012/6/23 Bruce Fischl
<fis...@nmr.mgh.harvard.edu>
Hi Gabor
are you thresholding the BA4 label?
In 5.2 we
will distribute
some tools to automatically
threshold the
labels so that the
predicted area has the average area
of the
input labels. The
right BA44 had more spatial spread
than the
left, so you might
be including a lot of low
probability vertices.
cheers
Bruce
On Sat, 23 Jun 2012, Gabor Perlaki
wrote:
Dear Bruce,
In the paper "Left-right
asymmetry in
volume and
number of neurons in adult
Broca's area." by Katrin
Amunts, 10
subjects (5 men
and 5 women) were
studied, and the volume of
BA44 was
greater in the
left hemisphere than in
the right in all ten cases.
So, it is
very strange
that the volume of BA44
was greater in the right
hemisphere in
all of the 80
subjects analyzed by
Eniko.
Thanks,
Gabor
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