Explicit access to phonetic representations in 3-month-old infants.

Preverbal infants are particularly good at discriminating syllables that differ by a single phoneme but do they perceive syllables as a whole unit or can they become aware of the underlying phonemes if their attention is attracted to the relevant level of analysis? We trained 3-month-old infants to pair two consonants, co-articulated with different vowels, with two visual shapes. Using event-related potentials, we showed that infants generalize the learned associations to new syllables with respect to the training phase. The systematic pairing of a visual label with a phonetic category is rapidly learned in a few trials, suggesting that phonemes are natural categories for infants but also that phonetic representations are accessible to internal operations outside the linguistic system. Hence, the possibility of an explicit access to the phonetic level, which is the main process underlying alphabetic reading system, is grounded in the early faculties of the human infant.