Dear Experts,

I would like to generate a gray matter mask using the aparc+aseg.mgz file.

Now, my question is whether there exists a file in addition to the FreeSurferColorLUT.txt file, which more explicitly, i. e., withouth the abbreviations, explains the labels, because I find it hard to decide whether, e. g., "Left-VentralDC", "Line1", "LeftmOg", or "Left-Interior" belong to gray matter, or not (to name only a few of those labels I cannot clearly classify).

Or is there a easier way to create a gray matter mask?

Thank you very much in advance!

Best regards, Lucas Eggert