FIGURE 1.

Simple and complex stimuli during an experimental trial. (A) In the trials of the simple condition, the audio-visual stimuli were two side-by-side videos of an unfamiliar infant being bounced rhythmically to a simple version of a children’s song. (B) In the trials of the complex condition, the stimuli were two side-by-side videos of an unfamiliar woman dancing to the complex version of the same children’s song. In each trial of both conditions, one video was synchronous while the other one was asynchronous with the song; and the positions of the two videos (left/right) were pseudo-randomized across trials.