Comment Requires surgery (Score 1) 92
Nature news itself covers this story a little better here.
You might be interested to know that the volunteers for this study were patients with severe epilepsy, and the neural recordings were from electrodes actually inserted into the patients' brains. Similar work has been done recording from the brains of e.g., monkeys in order to control a robotic arm (rather than control a video display). This involves invasive surgery that wouldn't be done unless there was also a medical necessity for it.