Fig. 3.

Latency facilitation and amplitude reduction. Shown is the latency and amplitude difference of N1/P2 in AV syllables as a function of correct identification in the visual-alone condition (experiments 1 and 2, n = 26). The latency (Upper) and amplitude (Lower) differences are the latency (or amplitude) values for the A condition minus the latency (or amplitude) for the AV condition for the N1 (blue) and P2 (red) ERPs. A positive value means that AV is faster than A. The temporal facilitation of the N1 and P2 increased as the saliency (correct identification) of visual inputs improved. The amplitude reduction in AV speech (Lower) remained constant across syllables and is independent of visual saliency.