The branches · Memory and thinking · could move a stage within 5 to 20 years
A brain implant improves memory recall in a person
People with severe epilepsy sometimes have electrodes placed deep in the brain for a week or two while surgeons find the source of their seizures. Researchers have used that window to stimulate the memory parts of the brain while the person learns a list or a route, and found that the right stimulation at the right moment helps them remember more. It is a first human, done in patients who already had the electrodes, and no device exists that a person could have fitted for this.
What would count
A person with electrodes implanted in the brain scores measurably better on a standard memory test when the electrodes are stimulated during learning than when they are not, in a peer-reviewed report with a control condition.
Who settles it: Peer-reviewed reports of the implanted patients; a regulator's approval record if a memory device is approved
Where it stands
First human. Reached on 9 February 2012, on the record of doi.org. Could move a stage within 5 to 20 years.
The last reading
Once a week every upgrade is read against the news, against what would count above. Open a line to see what that week held. Every reading of this upgrade is on this week's reading.
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16 October 2026 Nothing new
Nothing in the window. The searches returned only the 2017 and 2018 reports already in the entry's notes; no new trial registration and nothing toward a regulator's approval.
Notes
The record is the 2012 Los Angeles report of epilepsy patients who learned routes through a virtual town better when the entorhinal area was stimulated. Two 2018 reports went further: a Pennsylvania group's implant that stimulated only when the brain was in a poor state for learning, and a Wake Forest group's implant that played back the person's own successful memory patterns, both improving recall by about a third in the tests used. The animal record is the 2011 rat hippocampal prosthesis from the Wake Forest and Southern California groups. Every human result is in epilepsy patients who had the electrodes for other reasons, and at least one well-run study (2016) found stimulation of the same region made memory worse, so "improves" depends on the exact target and timing.