Well covered on the web is this story of how a man undergoing Deep Brain Stimulation with electrodes was suddenly able to recall long-lost memories:
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.
Dr Delgado would be proud.
“The individual may think that the most important reality is his own existence, but this is only his personal point of view. This lacks historical perspective. Man does not have the right to develop his own mind… We must electronically control the brain. Someday armies and generals will be controlled by electric stimulation of the brain.”
Dr José Delgado, Yale University Medical School Congressional Record, February 24, 1974