Ever since the discovery of the 12-year-old boy Victor in 1799, who had been abandoned in the forest at birth and remained unreceptive to human sounds the rest of his life, there have been many hypotheses about the affect of age on language acquisition. Although some of them soon proved their validity for the first language, they were, for long, still open to much controversy in the application for the second one. In 1978, Catherine Snow and …showed first 75 words of 2259 total…

…showed last 75 words of 2259 total…P. & Spana, N. (1999). How language are learned. Hongkong: Oxford University press. Stephen, K. (1997). Principle and practice in second language acquisition. UK: Oxford University Press. Sternberg, R. J. (2000). Pathway to psychology. Retrieved November, 3, 2001 from the World Wide Web: http://www.dawson.cc.mt.us/faculty/Korpi/understanding.html Twyford, C. W. (1998). Language theory and mental development. UK: Oxford University Press. Viley, J. (1997). Cognition and the development of language. USA: Prentice Hall Regents, Prentice Hall Inc.