Scientists have designed a brain implant that sharpened decision making and restoredlost mental capacity in monkeys, providing the first demonstration in primates of the sort of brain prosthesis that could eventuallyhelp people with damage from dementia , strokes orother brain injuries.
The device, though years away from commercial development, gives researchers a model for how to support and enhance fairly advanced mental skills in the frontal cortex of the brain, the seat of thinking and planning.

http://www.youtube.com/watch?v=EbCoDf44oCE