Electrophysiological evidence of non-spatial inhibition of return affecting audiovisual integration

Audiovisual integration (AVI), the process of combining visual and auditory stimuli into a cohesive perceptual experience, is crucial in multisensory perception. The present study delves into the impact of non-spatial inhibition of return (IOR) on AVI, utilizing the high-resolution event-related potential (ERP) technique within a prime-neutral cue-target paradigm. We specifically examined the neural underpinnings of AVI disparities in the context of valid and invalid targets. Our behavioral analysis revealed a notable diminution of AVI in cases involving valid targets, with a pronounced effect in trials featuring Chinese character primes. Intriguingly, ERP results demonstrated substantial AVI within the N400 and P300 components. The study's novelty lies in identifying the P300 component as the primary neural correlate for the attenuation of AVI due to non-spatial IOR, a finding not replicated with color block primes. These insights not only corroborate the late attention theory and the co-activation model but also substantiate the context-updating hypothesis. Overall, our research provides novel ERP evidence elucidating the mechanisms by which non-spatial IOR modulates AVI, thereby contributing significantly to the broader understanding of the cognitive processes underlying multisensory perception and attentional dynamics.