The ERP Signal Analysis of Visual Influences on Auditory Intensity Perception

Pervious studies have reported the supramodal interactions in different sensory modalities. The aim of this paper is to investigate the influences of visual spatial sensory on the auditory intensity perception by event-related potentials (ERP) analysis. The subjects were requested to judge the sound level companied with phase-locked visual stimulus. Behavior results demonstrated more auditory judgment error when the subjects were stimulated with the resized visual patterns. The ERP waveforms elicited at C3 and T3 indicated significant amplitude enhancement in the components at 175∼200ms and 200∼220ms after the second stimuli onset. Both ERP and behavior results confirmed the existence of the Supramodal interaction between visual spatial sensory and the auditory intensity perception, i.e. that visual spatial sensory could suppress the perception of auditory intensity.