According to a study published in the International Journal of Neuropsychopharmacology in 2018, specific brain waves are related to the anti-anxiety effects of ketamine. The brain waves involved in this function are called theta waves, found in the right frontal area of the brain. Ketamine can treat a wide variety of neurotic disorders, such as depression, generalized anxiety disorder, and PTSD, but researchers do not conclusively understand how ketamine works to relieve the symptoms of these disorders.