Fig. 4.

(A) Grand average responses to audiovisual speech stimuli measured at the vertex region of interest (average of 9 electrodes FC1, FCz, FC2, C1, Cz, C2, CP1, CPz, and CP2) for younger and older adults. The dotted red line indicates auditory onset. (B) Mean amplitudes and latencies of the ERPs elicited in response to standard (s) and deviant (d) audiovisual speech stimuli, for younger and older adults. Error bars indicate the standard error of the mean. Abbreviation: ERPs, event-related potentials. (For interpretation of the references to color in this figure legend, the reader is referred to the Web version of this article.)