In 1924, the field of neurology was transformed by the introduction of electroencephalography, a pioneering technique that enabled the recording of the brain's electrical activity directly from the scalp. By capturing these subtle bioelectrical signals, researchers and clinicians gained an unprecedented, non-invasive window into the functional workings of the human brain. This development marked a significant shift in medical diagnostics, moving away from purely observational methods towards a more empirical understanding of neurological processes.

The clinical utility of the EEG quickly became apparent, particularly in the study and management of complex neurological conditions. It provided medical professionals with a vital tool for observing brain wave patterns, which proved essential for the following applications:

• The identification and diagnosis of epilepsy.
• The investigation of various sleep disorders.
• The assessment of diverse brain injuries and conditions.
• The monitoring of neurological function in real time.

By offering a safe and repeatable method for investigating the central nervous system, electroencephalography became a cornerstone of modern diagnostic medicine. Its ability to map electrical impulses without the need for surgical intervention allowed for more accurate assessments of patient health, fundamentally changing how clinicians approach the study of the brain and its many disorders.