As you know from your research, hyperbaric oxygen treatment (HBOT) has been used to treat autism for several years. Medical researchers have discovered that autistic brains exhibit inflammation in those sectors that control mood, speech, academic performance, social function, and even OCD-like behaviors.
Brain tissue is susceptible to malfunction when inflammation occurs. Since hyperbaric treatment and elevated-pressure treatment, like you find in The Rejuvenator, are known to reduce inflammation, it stands to reason that when inflammation of the brain is treated by pressure treatment, more normal brain functions return.