Dear Freesurfer exerts,

I read sentences similar to this one in multiple publications (e.g. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3500581/)

"Power analyses were carried out using vertex-wise variance estimates from the coregistered cortical thickness maps, systematically varying processing parameters. "

Please how can I use freesurfer to do power analysis. Cortical thickness (vertex-based analysis) is very well documented in Freesurfer wiki. How can I use the output of this analysis (i.e. gamma.mgh and the gammavar.mgh ) to measure the power.

I highly appreciate any advice.

John