| Abstract | Phonetic production and perception are part of the natural endowment of the human race. As soon as infants can be tested, they show an ability to distinguish between phonetic categories (e.g., Kuhl, 1987; Kuhl & Meltzoff, 1982; Molfeese, & Molfeese, 1979) and very early in life they are able to use phonetic elements and a few rules of combination to form phonologic structures that represent words. Children’s phonological perception ability is, in fact, admirable. Even though the several phonetic gestures that are included in a phonological structure are co-articulated and therefore their acoustic effects overlap, very young children are able to decipher the phonetic code and distinguish between words on the basis of single phonemes (Eimas, 1975; Eimas, Miller, & Juscyzk, 1987; Eimas, Sequeland, Juscyzk, & Vigorito, 1971; Morse, 1972). Moreover, the deciphering of the phonetic code requires very little attention and effort. These findings lead several investigators to propose that the perception of speech is accomplished by a precognitive process controlled by a distinct biological module which is specialized to recover the coarticulated gestures from the acoustic stream and provide the cognitivie system with unequivocal phonological information (Liberman & Mattingly, 1989; Mattingly & Liberman, 1990). |