Results
Syllable Responses. Figure 2a illustrates the mean proportion of /da/ responses (the classical McGurk/Macdonald fusion) for each group as a function of SOA for congruent and incongruent trials. Figure 2b shows the mean proportion of /da/ responses on incongruent trials, collapsed across SOAs for each group, as a function of age (divided into bins of 10 years). This provides insight into the influence of age on the occurrence of the illusion, and allows a comparison between groups that is not confounded by their disparity in age (see Table 1 and Figure 1).