Mean of Preference scores (%) toward the visual speech (Standard Deviation) across baseline and test trials in Experiment 1a, depending on infants’ age (4.5- or 6-month-olds) and audio language (German or French); auditory-only familiarization lasted 30 seconds.

Note: T-tests to compare the Preference scores between the audio-matching visual speech across test trials to preferential looking across baseline trials and t-tests comparing preference scores across test trials to chance are also represented.