A lot of trouble to go to for a better memory

A short report at Nature:

A well-timed zap to a brain region involved in learning can improve memory.

Michael Kahana at the University of Pennsylvania in Philadelphia and his colleagues studied memory in 25 people who had had electrodes implanted into their brains for medical reasons. The researchers recorded brain activity while the individuals studied a list of words that they later tried to remember. Using computer algorithms, the team identified patterns of brain activity for each person that predicted whether the individual would remember or forget a word.

Next, participants studied another set of words. Whenever the algorithm predicted that a word was not being encoded well, the researchers applied electrical currents to a brain region called the lateral temporal cortex, changing the brain’s activity patterns. Precisely timed electrical stimulation improved people’s chance of recalling a word by an average of 15%.