Fig. 2: Time course of fusion-induced recalibration.

Participants (n = 26) completed additional auditory-only post-tests at monthly intervals, without any additional McGurk exposure. For participants who experienced the McGurk effect during the 14 days of McGurk exposure (fusion perceivers), there were three patterns of responses. One group of participants reported many dada percepts at every post-test (circles; n = 2). A second group reported a moderate number of dada percepts at the first post-test, and fewer at subsequent tests (squares; n = 5). A third group reported few dada percepts at any time point (triangles; n = 6). For participants who did not experience the McGurk effect during exposure (auditory perceivers), there were no dada percepts at any time point (gray circles; n = 13). Error bars show the standard error of the mean across participants. Lines show the best-fit non-linear regression model for each group.