https://www.darpa.mil/program/restoring-active-memory
"We can identify the signatures of the brain that tell us when you're going to make a good memory recall or when you're going to stumble on your memory recall," Sanchez said. "And we can actually deliver direct stimulation to the brain in order to facilitate memory formation and recall."

At DARPA's annual "Demo Day" at the Pentagon,
Justin Sanchez, Doctor, the director of the agency's biological technologies office.
https://www.darpa.mil/staff/dr-justin-sanchez