step 1

BRAIN IMPLANT

Surgeons embed a chip with 96 electrodes in the patient’s brain. The electrodes "read" the commands from the part of the brain that controls hand movement.

step 2

TRANSMITTER

A wire connects the chip to a port, screwed into the skull. The port connects to a cable that carries the information from the brain chip.

step 3

DECODING

The cable (not shown) links to a computer, where an algorithm "decodes" the brain commands and adds additional commands, which normally would come from the spinal cord.

step 4

ELECTRODE SLEEVE

The computer connects to a "sleeve" of electrodes wrapped around the arm, which fire in a sequence to stimulate muscle fibers, which trigger the movements the patient is thinking of. The whole process lasts less than a tenth of a second.

SOURCE: Battelle.