This is almost eerie.
A 50 year old man, dangerously obese, goes to the hospital for experimental brain surgery to suppress his appetite. A small piece of his skull is removed, and an electrical probe inserted deep into his brain tissue. It reaches his hypothalamus and current is switched on. Suddenly the patient -- awake through the procedure -- begins to speak uncontrollably about events in his past, events he had long forgotten. He remembers a day's walk in the park 30 years ago, complete with what people were wearing, all in vivid color. He sees them speaking to him, every motion they made. The intensity and level of detail of the memories is frightening.
The scene may read like the script of a bad science fiction flick but it comes from an unidentified patient at Ontario's Toronto Western Hospital.
If this really works, imagine what it could do for Alzheimer's patients, or for otherwise healthy people who just have something important to remember.