When1: 1924
Who: Hans Berger [Berger, Hans]
What: psychiatrist
Where: Germany
Detail: He lived 1873 to 1941 and invented electroencephalogram [1924]. Electrodes can measure scalp electrical potentials {electroencephalography, Berger}. Alpha waves are regular 10-Hz oscillations that happen when people relax and close their eyes. Beta waves are faster and less synchronous oscillations that replace alpha waves when people perform mental activity and keep their eyes open.
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Date Modified: 2022.0224