The clinical trials that are on-going right now are looking at post-concussion treatment with 60 mins of 100% O2 at 1.5 ATA. I believe they are doing 5 sessions/week for 40 sessions. Here's a link to the clinical trial: http://clinicaltrials.gov/show/NCT01105962. The preliminary data is impressive.
We have treated a few patients with post concussion symptoms and have had some good results. Unfortunately, insurance does not cover this indication.