BackgroundA widened temporal window of integration (TWI) in audiovisual processing has been detected for children with autism spectrum disorder. However, research indicates a narrowing of this TWI and an associated change in audiovisual integration in the course of development. MethodsTo further elucidate audiovisual integration processes in adulthood, we compared adult participants with Asperger’s Syndrome (AS) to healthy controls (HC) by using the sound-induced double flash illusion. For a better understanding of underlying neural mechanisms, event-related potentials were measured via electroencephalography (EEG). ResultsThe number of reported sound-induced flash illusions indicated audiovisual integration. A similar TWI size for both, participants with AS and HC, was found. Additionally, enhanced P2 amplitudes were detected for participants with AS compared to HC. ConclusionResults indicate an involvement of attentional processes in audiovisual perception in participants with AS.