Working in Germany during the 1920s, Hans Berger, a psychiatrist, developed the human electroencephalograph (EEG - brainwaves'). Its important application from the 1930s onwards was in the field of epilepsy. The EEG revealed the presence of electrical discharges in the brain. It also showed different patterns of brainwave discharges associated with different seizure types. The EEG also helped to locate the site of seizure discharges and expanded the possibilities of neurosurgical treatments, which became much more widely available from the 1950s onwards in London, Montreal and Paris.
Source: World Health Orginization (WHO) Factsheets
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