Scientists performing experimental brain surgery on a man aged 50 have stumbled across a mechanism that could unlock how memory works.
The accidental breakthrough came during an experiment originally intended
to suppress the obese man’s appetite, using the increasingly successful
technique of deep-brain stimulation. Electrodes were pushed into the man’s
brain and stimulated with an electric current. Instead of losing appetite, the
patient instead had an intense experience of déjà vu. He recalled, in intricate
detail, a scene from 30 years earlier. More tests showed his ability to learn
was dramatically improved when the current was switched on and his brain
stimulated.