
Hans Berger
Making the brain's electrical rhythms visible
Working in Jena, the psychiatrist Hans Berger recorded the human electroencephalogram in 1924 and published his first report in 1929. His recordings established a way to study electrical rhythms from the human head, opening a path for clinical EEG and, decades later, feedback based on those signals.
Contribution in context
Berger's achievement was measurement. Neurofeedback added a later step: returning information about a brain signal to the person producing it. The small waveform in this site's logo is traced from Figure 13 of his 1929 report.