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Motor cortex brain areas. 3-D magnetic resonance imaging (MRI) scan of the brain mapped to reveal areas of the cerebral motor cortex, which controls voluntary muscle activity. This mapping is used in virtual reality assisted surgery. Electric currents are first applied to parts of the motor cortex to trigger muscle responses in the body and create a map. The map is shown by colour-coded cylinders which give intensity of response: red (strong), yellow (medium), green (weak) and grey (no response). Surgery, such as tumour removal, can then be done without risking damage to the motor cortex.

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