This photograph shows the surface (cortex) of a human brain belonging to an epileptic patient, displaying the arteries and veins that supply its nutrients and oxygen. This photograph was taken before an intracranial electrode recording procedure, in which a flexible electrode grid is attached to the surface of the brain. The patient is then taken to the telemetry ward, where they are observed and recorded for a period of up to two weeks. Post-observation, the surgeon reviews the recordings and evaluates the data using the unique numbers on the grid implant to identify the specific areas of the brain that need to be removed during the next operation. This patient made a full recovery and no longer suffers from epileptic fits. (Photo by Robert Ludlow, UCL Institute of Neurology, London/Wellcome Images)