Exposure of patients to a high oxygen environment is a standard treatment in a select group of patients. The development of oxygen toxicity must be avoided in those patients. This book describes the effects of normobaric and hyperbaric oxygen treatment of animal models on brain biochemical and physiological responses. This book provides a summary of our knowledge on the effects of hyperbaric oxygenation on mitochondrial activity in vivo, and other functions of the brain. A chapter covering the use of hyperbaric hyperoxia in patients’ brain pathology and care is also included. This is an ideal book for students, research groups, and clinicians studying hyperbaric oxygen and its connection to mitochondrial activity and brain physiological functions.