J024011 Modulation of audio-visual integration by temporal alignment of visual and auditory stimuli : an event-related potential study

Abstract

Interaction occurs in brain when human gets stimuli from different sensory organs such as visual and auditory ． Previous behavioral studies have shown that bimodal audiovisual stimuli simultaneously can be discriminated or detected more rapidly and accurately than unimodal visual or auditory stimuli presented alone ． Many studies have shown that temporal asynchrony of audio − visua 匡 stimuli can inf 苴 uence the integration between visual and auditory stimulus ， however ， the multisensory mechanisms of asynchrony 量 nputs were not well understood ． In this study ， we measurcd the behavioral and EEG data when the visual and auditoIy stimu ［ i onset asynchrony wcre presented in the screen ． This was done fbr each of the five different 50− ms subranges of stimulus onset asynchrony ． Behavioral results showed that reaction times to the asynchrony audiovisual stimuli werc faster that the unimodal stimulus ． Moreover ， the interaction of the asynchrony input was verified f ｝ om event related potentials ( ERPs ) ， Especially ， the results showed that the effect on EEG component around 200ms was largest when visual was presented after the auditory stimuli． This result suggested that might refieCt the proeessing or adjusting for the temporal alignment ofaudiovisual stimuli ． KePt MordS ： Biomed 孟 cal engineering ， EE ( 廴 Event−related potentials ( ERP ) ， Audiovisual integration