title: Neurophysiological Correlates of Visual Dominance: A Lateralized Readiness Potential Investigation.
abstract: When multisensory information concurrently arrives at our receptors, visual information often receives preferential processing and eventually dominates awareness and behavior. Previous research suggested that the visual dominance effect implicated the prioritizing of visual information into the motor system. In order to further reveal the underpinning neurophysiological mechanism of how visual information is prioritized into the motor system when vision dominates audition, the present study examined the time course of a particular motor activation ERP component, the lateralized readiness potential (LRP), during multisensory competition. The onsets of both stimulus-locked LRP (S-LRP) and response-locked LRP (R-LRP) were measured. Results showed that, the R-LRP onset to the auditory target was delayed about 91 ms when it was paired with a simultaneous presented visual target, compared to that when it was presented by itself. For the visual target, however, the R-LRP onset was comparable irrespective of whether it was paired with an auditory target or not. No significant difference was obtained for the onset of S-LRP. Taken together, the time courses of LRPs indicated that visual information was preferentially processed within the motor system, which coincides with the previous finding that the dorsal visual stream prioritizes the flow of visual information into the motor system.
authors.affiliation: Center for Studies of Psychological Application and School of Psychology, South China Normal University Guangzhou, China.
authors.forename: You
authors.initials: Y
authors.lastname: Li
authors.affiliation: Shanghai Kohden Medical Electronic Instrument Corporation Shanghai, China.
authors.forename: Mingxin
authors.initials: M
authors.lastname: Liu
authors.affiliation: Epilepsy Center, Guangdong 999 Brain Hospital Guangzhou, China.
authors.forename: Wei
authors.initials: W
authors.lastname: Zhang
authors.affiliation: Department of Psychology and the Center for Mind and Brain, Guangzhou University Guangzhou, China.
authors.forename: Sai
authors.initials: S
authors.lastname: Huang
authors.affiliation: Department of Psychology and the Center for Mind and Brain, Guangzhou University Guangzhou, China.
authors.forename: Bao
authors.initials: B
authors.lastname: Zhang
authors.affiliation: Epilepsy Center, Guangdong 999 Brain Hospital Guangzhou, China.
authors.forename: Xingzhou
authors.initials: X
authors.lastname: Liu
authors.affiliation: Center for Studies of Psychological Application and School of Psychology, South China Normal UniversityGuangzhou, China; Epilepsy Center, Guangdong 999 Brain HospitalGuangzhou, China; Guangdong Key Laboratory of Mental Health and Cognitive Science, South China Normal UniversityGuangzhou, China.
authors.forename: Qi
authors.initials: Q
authors.lastname: Chen
keywords: lateralized readiness potential; multisensory competition; the Colavita effect; visual dominance