Cybernetics - the fusion of human beings and technology - is helping one paralysed man control his environment by connecting his brain to his PC.
Quadriplegic ex-American football player Matthew Nagle is using a system that converts his thoughts into actions on a computer. Nagle's brain is connected to his computer by the BrainGate system, which thought impulses using a sensor implanted in the motor cortex of his brain.
The impulses, transmitted by 100 1mm long electrodes implanted in his brain, are converted into on-screen cursor movements that enable the 25-year-old to play computer games and open email. The on-screen cursor is directed by Nagle's brain activity - when he thinks of the cursor moving left, the BrainGate system recognises the pattern and moves the cursor accordingly