Does FreeSurfer have an option for calculating gray matter density during recon-all, or does one need to calculate it manually? In that case, what is the formula?
The reason I would like to compute density is to replicate the effects show in this paper: http://www.jneurosci.org/content/early/2017/05/02/JNEUROSCI.3550-16.2017. I have seen other threads on FreeSurfer indicating that density is gray matter per unit volume, but it's unclear how to compute this.