Hi Rhuang,
On that particular page the color bar is showing the sigificance (-log10(p)) for the group difference in that example. However, if you were displaying a cortical thickness map for an individual subject the color bar would then be showing the cortical thickness values (in mm).
It is showing the negative values to indicate the direction of the effect. Because of the way this analysis was set up the blue regions show areas where older subjects are significantly thinner than younger subjects and the red regions show areas where younger subjects are significantly thinner than older subjects.
Jenni
-----Original Message----- From: freesurfer-bounces@nmr.mgh.harvard.edu [mailto:freesurfer-bounces@nmr.mgh.harvard.edu] On Behalf Of Ruiwang Huang Sent: Wednesday, May 09, 2007 4:20 AM To: freesurfer@nmr.mgh.harvard.edu Subject: [Freesurfer] Does 'color scale bar' show the cortical thickness or[-log10(p)]?
Dear All,
I am puzzled by the meaning of 'color scale bar', which appears in the first
figure of the FsTutorial/Visualization (https://surfer.nmr.mgh.harvard.edu/fswiki/FsTutorial/Visualization)
Could you please let me know the meaning of colorbar? Does the 'color scale bar' show the cortical thickness or [-log10(p)]? Why the colorbar indicates the positive and negative value in the first figure?
Many thanks in advance
Rhuang
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