anti-Semitic comments. Dr Zimmermann's findings corroborated research published in Germany in 2003, documenting Berger's invitation by the SS racial hygienist Karl Astel to work for the EGOG (Erbgesundheitsobergericht, Higher Genetic Health Court) in 1941. Berger replied: "I am gladly willing to work again as an assessor at the Court for Genetic Health in Jena, for which I thank you." Berger did not join the SS, SA, or Nazi Party "despite the significant Nazification of the University of Jena, but was a supporting SS member, possibly for self-protection." After a long period of clinical depression, and suffering from a severe skin infection, Berger committed suicide by hanging on June 1, 1941, in the southern wing of the clinic. Research Among his many research interests in neurology, Berger studied brain circulation, psychophysiology, and brain temperature. One of his early experiments on the brain involved a gentleman with a cranial defect that left part of the brain exposed. The gentleman allowed Berger to insert a liquid-filled rubber tube through the hole in his skull. A latex cap sealed the opening, creating a pressure gauge. At the other end of the rubber tube was a pen that recorded the pressure fluctuations on paper wrapped around a rotating drum. Berger noticed that the pen recorded waves that would change when he asked his conscious participant to perform different cognitive tasks. He also observed changes when the participant experienced changes in emotions or sensory stimulation. Berger followed this work with his most significant contribution to modern science. British physician, Richard Caton (1842-1926), had previously described electrical potentials recorded from the exposed cortices of dogs and nonhuman apes. Berger's patient gave him the opportunity to apply Caton's technique to a human. The result was the first demonstration of human electroencephalography (EEG). In 1924, Berger made the first EEG recording of human brain activity and called it Elektrenkephalogramm. Using the EEG, he was also the first to describe the different waves or rhythms that were present in the normal and abnormal brain, such as the alpha wave rhythm (7.812 to 13.28 Hz), also known as "Berger's wave"; and its suppression (substitution by the faster beta waves) when the subject opens the eyes (the so-called alpha blockade). He also studied and described for the first time the nature of EEG alterations in brain diseases such as epilepsy. His method involved inserting silver wires under the patients scalp, one at