For neuroscientist Sara Lazar, a form of meditation called open awareness is as fundamental to her day as breathing. “I just become aware that I am aware, with no particular thing that I focus on,” explains Lazar, an associate researcher in the psychiatry department at Massachusetts General Hospital…

Over the course of a lifetime, as many as seven in 10 adults in the United States will directly experience or witness harrowing events. These include gun violence, car accidents, and other personal trauma; natural or human-made disasters, such as Hurricane Katrina and the 9/11 terrorist attacks; and…