https://futurism.com/darpas-new-brain-device-increases-learning-speed-by-40

New research funded by the U.S. Department of Defense’s Defense Advanced Research Project Agency (DARPA) has successfully demonstrated how a non-invasive method of stimulating the brain can boost cognitive performance. Working under DARPA’s Restoring Active Memory (RAM) program, scientists from HRL Laboratories in California, McGill University in Montreal, Canada, and Soterix Medical in New York tested their brain device on macaques and observed a substantial increase in the monkeys’ ability to quickly perform certain tasks.