“In experiments, people who were watching these screens … their ability to concentrate would fall off in about 20 minutes,” Szymanski said. “But they did studies whereby a little bit of electrical stimulation was applied, and they were able to maintain the same peak performance for 20 hours.”

Transcranial electrical stimulation was one of the technologies touted by then-Defense Secretary Ash Carter in July 2016 as part of his Defense Innovation Unit (Experimental), or DIUx, initiative. Since then, multiple SEAL units have begun actively testing the effectiveness of the technology, officials with Naval Special Warfare Command told Military.com

“Earlier this year, Naval Special Warfare units, working with DIUx, began a specific cognitive enhancement project with a small group of volunteers to test and evaluate achieving higher performance through the use of neuro-stimulation technology,” Capt. Jason Salata, a spokesman for the command, said in a statement.