the front of the head and one at the back. Later, he used silver foil electrodes attached to the head by a rubber bandage. As a recording device, he first used the Lippmann capillary electrometer, but results were disappointing. He then switched to the string galvanometer and later to a double-coil Siemens recording galvanometer, which allowed him to record electrical voltages as small as one ten-thousandth of a volt. The resulting output, up to three seconds in duration, was then photographed by an assistant. The EEG has been a useful tool in modern medical and psychological practices by allowing clinicians to describe and diagnose various conditions and diseases. If an individual goes to get an EEG, the doctor will look at the waveform patterns to determine how different stimuli affect the brain. These waveform patterns are called evoked potentials or EPs. If a patient's brain waves do not follow the normal EP pattern, that is an indication of a deficit in the processing of the stimuli. There are also event-related potentials, or ERPs, which provide information about mental processing of patients. Both EPs and ERPs are tools that can help doctors determine any abnormalities. The studies researching ERPs have also been helpful in the development of the brain mapping technique. Hans-Berger-Preis Hans-Berger-Preis is awarded triennially by the Deutsche Gesellschaft für Klinische Neurophysiologie (German Society of Clinical Neurophysiology) for long-standing, extensive academic work in theoretical or clinical neurophysiology. See also Sleep medicine Sources Notes 11. W. Grey Walter (1953), The Living Brain, p. 30 Print Primary sources Berger, Hans (1940). Psyche. Jena: Gustav Fischer. —. Über das Elektrenkephalogramm des Menschen. Archiv für Psychiatrie und Nervenkrankheiten, 1929, 87: 527-570. Secondary sources Fields, R. Douglas (2009). The Other Brain: From Dementia to Schizophrenia. New York: Simon & Schuster. Klee, Ernst (2005). Das Personenlexikon zum Dritten Reich: Wer war was vor und nach 1945. Frankfurt am Main: Fischer-Taschenbuch-Verlag. Hoßfeld Uwe, John Jürgen, Lemuth Oliver, Stutz Rüdiger (2003). "Kämpferische Wissenschaft" - Studien zur Universität Jena im Nationalsozialismus., Köln: Böhlau Verlag Gmbh. . Niedermeyer, Ernst and Lopes da Silva, Fernando (2005). Electroencephalography: Basic Principles, Clinical Applications, and Related Fields. Baltimore: Lippincott Williams & Wilkins (5th Edition). Radin, Dean (2006). Entangled Minds. New York: Paraview Pocket Books. Walter, W. Grey (1953). The Living Brain. New York: Norton. Online . Further reading External links Hans Berger bio at Encyclopedia.com Hans Berger at Who Named It.com 1873 births 1941