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Your nervous system has been examined and monitored during an operation.

The nervous system includes all the nerves in the body, as well as the brain and the spinal cord. The nerves run from the brain and spinal cord into the body. They convey information in the body. Nerves use electrical signals to convey information.

The operation involved opening up your skull. Sensors were attached to the surface of your brain. Sensors like these can be used to examine very specific areas in the brain.

Measurements have been taken of how your nervous system conveys signals. A noise and a touch are examples of these signals. An electrical current may also be used to stimulate specific nerves. This is usually done using fine needles that emit an electrical signal in the vicinity of the nerve. When the nerve is stimulated by the electrical signal it passes it on in the body. A sensor then measures whether and when the signal arrives.

The opposite may be done, too – an electrical signal can be sent at the brain and the reaction of the relevant body part can be measured. This reaction may be a muscle movement, for example.