Soldiers' helmets could control brain activity with ultrasound

Soldiers' helmets could control brain activity with ultrasound: "(PhysOrg.com) -- One of DARPA's latest pursuits of cutting-edge research involves a neurotechnology lab at Arizona State University that specializes in ultrasonic brain stimulation. By implementing the technology in soldiers' helmets, DARPA hopes to provide advantages to US troops by enhancing cognitive abilities; improving long-term alertness; and reducing stress, anxiety, and pain."