ABSTRACT
This study investigated possible differences between adult stutterers and non-stutterers in P300 event- related potential. Twenty-seven adult right-handed stutterers and fifteen normal adult subjects were included. Both groups exhibited right-left asymmetry as regards P300 amplitude. Right ear showed higher P300 amplitude in both groups. In the left ear, stutterers showed prolonged latency and higher amplitude in P300 wave more than non-stutterers. This study supports the opinion of the existing brain changes in stutterers that could be studied by event related potentials. Further cognitive event-related studies are needed to compare between linguistic and non-linguistic stimuli to reveal more knowledge about brain changes occurring in stutterers