External Email - Use Caution Hi Julien
In researching this a few years ago I asked the question What exactly has been >> done to change the .label >> (e.g. lh BA44.label) to >> .thresh.label (e.g. lh >> BA44.thresh.label? And was told The .thresh labels have been >> thresholded with a p-value >> threshold that is "best" on our >> training set of >> manually/architectonically defined >> labels. I then looked into this a bit further and found the following explanation: On 14-09-08 12:39 PM, Anastasia Yendiki wrote: > On the difference between .thresh and "not .thresh" labels: The > BA labels come from averaging histologically derived labels from a set of > post mortem brains. The non-thresholded version is just the sum of the > corresponding labels from the different brains in fsaverage space. So > vertices are included even if only one of the brains had their BA in that > vertex, which means that these labels are going to be rather large. In the > thresholded version, a threshold has been applied to the average BA label, > to make it have an area as close as possible to the average area of the > individual BA labels. I hope this makes sense. I hope this helps! Trisanna Sprung-Much Research Associate McGill University MD Anderson Cancer Centre -- On 2021-02-18, 3:27 AM, "[email protected] on behalf of julienbesle" <[email protected] on behalf of [email protected]> wrote: External Email - Use Caution Hello, The ex-vivo BA label and annotation files named ?h.BA??_exvivo.thresh.label and BA_exvivo.thresh.annot seem to be thresholded versions of the corresponding probabilistic BA labels. Was a simple threshold on the probability used and if yes, what was the value? In addition the annotation files, whether thresholded or not, only have one label per vertex. Are the labels based on the maximum probability across all BA labels? Thanks Julien -- ------------------------------------------------------ Julien Besle Assistant Professor Department of Psychology Faculty of Arts and Sciences American University of Beirut Riad El-Solh / Beirut 1107 2020 Lebanon Jesup Hall, Room 103E Tel: +961 1 350 000 ext. 4927 ----------------------------------------------------- _______________________________________________ Freesurfer mailing list [email protected] https://secure-web.cisco.com/1XQKd9pXAr8qUGqeGMndR3TJOl3i07YuFeBt8v6LPq0Ro62i6h-ivXgLE85MdCQy_C9CD3rVltO97GONz3BNW3rblKwSS2Ve88Pc8LZmlHrJKU2H0Bxx4KA2gZDrgSrpyTJ6rKDfwa1Ooqb8k_mekLQN8Jy2TO8jA7BLe4YkwwoliTBMfhn5k3YGSkpwixody3rFZvZ8vp1QZwZItV_nZFkSrO7aSNXgJwgfDnsRBin97WVFydnfBO3ZYqsWiVTpmAkPZaY-ypSATaVJPP7NZmw/https%3A%2F%2Fmail.nmr.mgh.harvard.edu%2Fmailman%2Flistinfo%2Ffreesurfer _______________________________________________ Freesurfer mailing list [email protected] https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer
