The researchers behind this study knew that the same held true for monkeys, and they wanted to see how this convergence could be applied to the brain-machine interface. In the study, they sat groups of two or three monkeys in separate rooms in front of a computer screen. Each of these monkeys had electrodes implanted in the parts of their brains associated with motor skills and somatosensation, the sense of where the body is positioned in space. The monkeys all shared control of the digital arm, able to move it along various axes so that, together, the monkeys could complete a common task of moving the arm towards a circular target on the screen. Once they achieved that, the researchers gave them juice as a reward. They first learned to move the arm with a joystick, then the researchers hooked up their brain implants to control the arm with just their minds.