No really, they do. If you’re at all squeemish about certain kinds of animal testing, then this isn’t for you. For everyone else, there are several more videos of monkeys with microelectrode arrays implanted in their brains, able to feed themselves marshmallows, or do other tasks, with various different attached robotic arms.
The University of Pittsburgh’s Motorlab is the source, and according to someone on Reddit, they’ll be trying human trials very soon, offering spinal cord injury patients the hope of controlling robotic arms of their own. Of course, human trials are always very cautious, delicate, things, so don’t go expecting anime style neuro-plugged mech suits quite yet.