When it comes to improving memory, being in the right place at the right time could be key. Scientists are figuring out how to do that.

Michael Kahana, a professor of psychology at the University of Pennsylvania and his team developed an experimental brain stimulation technique that improves memory by applying a pulse of electricity directly to the brain when and where it’s needed most. In an early demonstration, they say their approach improved word recall in epilepsy patients by 15 perc