The operation was overseen by Dr. Eric Leuthardt, a man previously responsible for developing another Brain-Computer Interface that allowed patients to control video-games with their minds. Clearly, the good doctor's philosophy has taken a turn from "Let's play Space Invaders with our minds!" to "Let's invade Space with Cyborgs". This particular BCI is a net of ECoG (electrocorticographic) electrodes that was temporarily placed beneath the dura, a layer of connective tissue in the brain. Scary? Scarier is that it took some of the patients a mere 4 minutes to get used to the interface and operate a computer with ease. Leuthardt believes this will be instrumental in the operation of bionic prosthetics- I'll be damned if this doesn't get creepier by the word.
Here's a promotional video with more details. Hit the link above to read more about the technical stuff.