The study, conducted by the SunnybrookMuscle Rev Xtreme Health Sciences Centre and funded by the Ontario Neurotrauma Foundation and Ontario Mental Health Foundation, noted that "major depression is a complication seen in about one-third of patients within the first year of TBI and, when present, is associated with poor psychosocial functioning and persisting post-concussive symptoms."According to researchers, depression is often a symptom that develops after a traumatic brain injury has occurred. Most recently, scientists and medical professionals are reporting increased numbers of brain injury and post-traumatic stress disorder, which is a mental anxiety condition that affects individuals who have experienced extreme stress as described by the National Institute of Mental Health (NIMH), because of soldiers returning from the war in Iraq.

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