Researchers have developed a non-invasive brainwave mirroring technology that can significantly reduce symptoms of post-traumatic stress especially in military personnel. Post-Traumatic Stress Disorder (PTSD) is a disorder characterised by failure to recover after experiencing or witnessing a terrifying event. The symptoms include insomnia poor concentration sadness re-experiencing traumatic events irritability or hyper-alertness as well as diminished autonomic cardiovascular regulation. Ongoing symptoms of post-traumatic stress whether clinically diagnosed or not are a pervasive problem in the military said lead investigator Charles H. Tegeler professor Wake Forest Baptist Medical Centre in North Carolina. Medications are often used to help control specific symptoms