Event-Related Potentials, P300

**Definition:** A late-appearing component of the event-related potential. P300 stands for a positive deflection in the event-related voltage potential at 300 millisecond poststimulus. Its amplitude increases with unpredictable, unlikely, or highly significant stimuli and thereby constitutes an index of mental activity. (From Campbell, Psychiatric Dictionary, 6th ed)

**Tree numbers:** - G07.265.216.500.350 - G11.561.200.500.350

**Synonyms:** - P3 Event Related Potential - Evoked Potentials, P300 Component - P300 Component - P300 Event-Related Potentials - P3 Event-Related Potentials - P300 Event-Related Potential - Event-Related Potentials, P3