Expertise

The brain is always active. Even during sleep, millions of neurons are firing in coordinated patterns, producing tiny electrical signals that ripple across the scalp. The electroencephalogram (EEG) is the tool that makes those signals visible. Since its introduction nearly a century ago, [1,2] it has given clinicians and researchers a window into brain activity that no other technology can replicate: continuous, real-time, and non-invasive.