He was the first person to discover brainwaves!
In 1924, a light dawned in front of mankind, allowing a glimpse into the mysteries of the brain. One evening in July of that year, German physician Hans Berger first measured extremely weak electrical currents from the head of a patient with a damaged skull. After nearly five long years of experimentation, he finally confirmed that this mysterious current did indeed come from brain activity, and named the measurement he had invented the electroencephalogram (EEG). He discovered some of the patterns of brain electricity from more than a thousand EEG recordings and defined the brain waves that occur when people are awake and have their eyes closed as alpha (α) and those that occur when their eyes are open as beta (β).