Scientists have developed a revolutionary device that lets paralyzed people use their thoughts to perform tasks they never thought they'd be able to do again. A brain-computer interface, called BrainGate, has demonstrated how it can help paraplegics in the past, but new research shows that the device can be hooked up to a basic tablet to send text messages, show the weather forecast and even play a digital piano. Volunteers with severe paralysis had to have a chip the size of a baby aspirin implanted into their brains in order to use the tablet. Participants have a'baby aspirin'-sized chip implanted into their brain's motor cortex. The motor cortex is a part of the brain that is responsible for the planning, control and execution of involuntary movements.