From Nature

Brain-machine interfaces promise to aid paralyzed patients by re-routing movement-related signals around damaged parts of the nervous system. A new study in Nature demonstrates a human with spinal injury manipulating a screen cursor and robotic devices by thought alone. Implanted electrodes in his motor cortex recorded neural activity, and translated it into movement commands. A second study, in monkeys, shows that brain-machine interfaces can operate at high speed, greatly increasing their clinical potential.

So what does Animal Aid show and say?

Experimenting on monkeys with the hope of unlocking the secrets of the human brain is an exercise in futility. The most dramatic difference between humans and any other species, including the great apes, is found in the central nervous system. Our brain is four times larger than that of a chimpanzee, which is four times larger than that of a macaque. The human brain is enriched with specific cell types implicated in communication, language, comprehension and autonomic functions

Quote from the Nature paper:

This system consists of a chronically implanted sensor and external signal processors developed from preclinical animal studies.

More from Animal Aid:

I have yet to hear a sufficiently compelling scientific argument that justifies the suffering inflicted on primates in medical research. 
Dr Charlotte Uhlenbroek, leading primatologist and BBC science presenter.

Try this Dr Uhlenbroek:

Mr Nagle said the sensor had restored some of his independence by allowing him to carry out a number of tasks - such as turning the lights on - that a nurse would normally do for him.  He told the BBC: ‘I can’t put it into words. It’s just wild.’