He successfully implanted his device in normal rhesus monkeys without disturbing their hearing or sense of balance, and he was able to spark the vestibular system so that the monkeys' eyes moved as if they were spinning.

FORBES: Magazine Article

These include the frontal cortex (where decisions are made), the motor cortex (which controls muscle activity), the somatosensory cortex (where the sense of touch is located) and the part of the parietal cortex that regulates kinaesthesia (the sense of bodily motion, which is built up from signals from the muscles and the vestibular systems of the ears).

ECONOMIST: Bionics (I)