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Hello Jessica,
1) In the LME tutorial, the 'lhcortex' variable contains information about which vertices will be used for the analysis. I.e., it's a cortical mask. The information is read from the 'lh.cortex.label' file within the fsaverage directory.
The way to go would probably be to create a Freesurfer label file for your region of interest, akin to the 'lh.cortex.label' file, read it into a Matlab variable, and use this variable instead of the 'lhcortex' variable during your analyses.
2) Can't tell at the moment, but may have time to take a closer look next week.
Best,
Kersten
On Sa, 2019-06-15 at 02:57 +0000, Hua, Jessica wrote:
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Hi FreeSurfer Experts,
I had two questions regarding the longitudinal process.
1) I am using the linear mixed effects mass-univariate approach to analyze my longitudinal data. A priori I am interested in the orbitofrontal cortex and the parahippocampal gyrus. Is there a way in FreeSurfer to mask my longitudinal analyses to these regions specifically?
2) Also is there a way to modify the FDR2? My analyses do not meet the FDR2 (q < .05) p threshold of 4.29, and I wanted to see what threshold it is meeting. Specifically, I wanted to see if it was meeting q < .1. In the lme_mass_FDR2.m, I tried to change the rate to .1, but i kept getting the same result as when it was .05.
Thank you in advance for your help!
Best,
Jessica Hua
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