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Two-month-olds are sensitive to lip rounding in dynamic and static speech events

Our research replicates and extends previous work on infant audio-visual speech perception [3], [4], [5], demonstrating that two-month-old infants have knowledge of the audio-visual connection between the visual aspects of lip-posture and the pronunciation of vowels and glides. Using the intermodal preferential looking paradigm [6] the infants display a clear ability to distinguish /a/-/u/, /i/-/u/ and /i/-/wi/. The infants’ ability to discriminate /i/-/wi/ shows that even dynamic aspects of speech production within single syllables are salient to the infants.