Brain-hand control from MEG scan. Computer image showing a 3-D human brain inside an opened cranium and a hand, depicting brain to hand nerve control. Colour-coding on tips of the fingers corresponds to coloured areas inside the cerebrum. Each finger is controlled by a separate motor area in the brain, which send movement commands to the muscles involved. This brain-hand data was obtained from a magnetoencephalography (MEG) scan that measures magnetic fields generated from nerve cell activity in the brain. The image of the brain was construc- ted from 3-D Magnetic Resonance Image (MRI) data. Photographed at New York University Medical Centre in New York City, USA.