Abstract
A combination of signals across perceptual modalities can facilitate sensory perception. Congruent visual information is generally considered to complement insufficient speech information for hearing-impaired and normal listeners in noisy conditions. In order to develop effective audiovisual strategies for speech perception, it is important to understand the mechanism accounting for the audiovisual integration ability. The present work investigated the effect of simultaneous visual stimulation on detecting auditory frequency changes with random stimulus sequences. Event-related potential responses with normal-hearing listeners showed that simultaneous visual and auditory stimuli elicited larger N1/P2 amplitude and shorter P2 peak latency than auditory-only stimuli did. The present study provided neurophysiological evidence that the cross-modal correspondence between the size of visual stimulus and the level of auditory pitch favors the detection of auditory frequency changes presented in random stimulus sequences.
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