... increased affect on a human brain. The first person to study how electrical currents effected the brains of humans was Penfield in 1958. He operated on people whom had severe brain tumours or epilepsy. He decided to carry out an experiment on a group of his patients (with their consent) into how electrical stimulation affects the brain. He gave his patients small electrical shocks to various parts of their cerebral cortex during the operations and asked the patients to report what they experienced (as the brain has no pain receptors the patients were fully awake). He found that when he stimulated different parts of the brain there were a series of different affects on the patients. E.g. when he stimulated the auditory sensory cortex of one of his patients brain the person reported that they suddenly could not hear. These discoveries where quite magnificent at the time and led ...

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