The child must also be physically capable of sending and raceiving sound signals in a language. All infants make "cooing" and "babbling" noises during their first year, but congenitally deaf infants stop about six months. So, in order to speak a language, a child must be able to hear that langauge being used. By itself,however, hearing language sounds is not enough. One case, reported by MoskowitZ (1991), demonstrated that, with deaf parents who gave their normal-hearing son ample exposure to television and radio programs, the boy did not acquire an ability to speak or understand English. What he did learn very effectively, by the age of three, was the use of American Sing Language, that is, the language he used to interact with his parents. A crucial requirement appears to be the opportunity to interact with others via language