Researched
EEG
Electrodes on the scalp record the brain's electrical rhythms in a living person.
Open in the interactive tree →Hans Berger, a psychiatrist in Jena, recorded the first human electroencephalogram in 1924 and published it in 1929, describing the alpha rhythm. EEG became the standard test for epilepsy and sleep and a window on brain states with millisecond resolution. It is still the basis of many brain-computer interfaces.
Prerequisites
- Nerves run on electricity1791
- Electromagnetism1831-1865
- Electrocardiogram1903Berger recorded brain waves with a galvanometer, the instrument Einthoven made sensitive for the ECG
- Vacuum Tube (Triode)1906Brain signals are microvolts; tube amplifiers made recording practical