P300 (EP300)

The P300 (also called EP300 in some contexts) is a specific brainwave that occurs approximately 300 milliseconds after a person encounters an unexpected or significant stimulus, such as a sudden sound or visual cue. It reflects the brain's process of recognizing and evaluating important information, playing a key role in attention and decision-making. Detecting the P300 helps scientists and clinicians understand how the brain processes information and can be useful in diagnosing neurological conditions, monitoring cognitive function, or developing brain-computer interfaces.