Lip reading in infants: Attention to speech presented in- and out-of-synchrony

Twelve 10- to 16-week-old infants were presented with nursery rhymes spoken with speech sounds and lip movements in-synchrony and out-of-synchrony by 400 msec. Two observers measured the amount of time the infants did not attend to the two types of stimuli. The results showed that the infants attended significantly less to the out-of-synchrony presentation than to the in-synchrony presentation. This finding was interpreted as an indication that young infants are aware of the congruence between lip movements and speech sounds.