Johnson and Newport (1989) sought to further probe the relationship between the effects
of maturation and the ability of an individual to acquire a second language. Specifically, they
first aimed at either verifying or disproving the existence of age-related effects on second
language acquisition of grammar by establishing a correlation between age of first exposure to a
language and level of morphosyntactic accuracy in that language. Forty-six native Chinese and
Korean speakers who had arrived in the United States between the ages of 3 to 39 and had
learned English as a second language were asked to determine the grammaticality of a variety of
English sentences in order to determine their respective knowledge of English morphosyntax.
Subjects were divided into 4 groups depending on their age of arrival (age 3-7, age 8-10, age 11-
15, and age 17-39, respectively), and their overall performance on this grammaticality judgment
test was then examined for correlations between age of arrival and test score.
Johnson and Newport (1989) sought to further probe the relationship between the effectsof maturation and the ability of an individual to acquire a second language. Specifically, theyfirst aimed at either verifying or disproving the existence of age-related effects on secondlanguage acquisition of grammar by establishing a correlation between age of first exposure to alanguage and level of morphosyntactic accuracy in that language. Forty-six native Chinese andKorean speakers who had arrived in the United States between the ages of 3 to 39 and hadlearned English as a second language were asked to determine the grammaticality of a variety ofEnglish sentences in order to determine their respective knowledge of English morphosyntax.Subjects were divided into 4 groups depending on their age of arrival (age 3-7, age 8-10, age 11-15, and age 17-39, respectively), and their overall performance on this grammaticality judgmenttest was then examined for correlations between age of arrival and test score.
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