Prepared by Manuel Jimenez
Second Language
Acquisition and Age
Language acquisition has been a major topic of research in
linguistics for several decades. Attempts to
explain the differences between children's and adults' acquisition of first and
second languages have led to the development of the Critical Period Hypothesis
(CPH).
This hypothesis states that there is "a biologically determined
period of life when language can be acquired more easily and beyond which time
language is increasingly difficult to acquire." (Brown 53) Originally,
this hypothesis only included first language acquisition, but later researchers
have extended it to second language as well. Many aspects of first language
acquisition were brought into the domain of second language acquisition, but
the assumption that the two types of acquisition are similar is fundamentally
flawed.
Genesee’s article
explains the research of linguists who tried to relate the CPH to second
language acquisition, but whose results remained questionable or inconclusive.
Working independently, Penfield and Lenneberg suggested two reasons why
language acquisition is difficult after puberty. Penfield maintained that the
plasticity of the brain is lost "at puberty, after which complete or
nativelike mastery of languages, first or second, is difficult and
unlikely." (Genesee 98) This plasticity assigns functions to different
areas of the brain and cannot be changed. Penfield noted that children who
suffered brain damage before 9 to 12 years of age could recover language skills
completely, but children who had suffered brain damage after puberty could not.
Lenneberg agreed
that language learning after puberty was more difficult, but argued that the
completion of "lateralization of language functions in the left
hemisphere" (98) was the cause. Lenneberg studied children who suffered
damage to the left hemisphere of the brain before and after the
age of 12. The transfer of language function to the right hemisphere was found
in children who suffered damage before age 12, but rarely in those who suffered
damage after age 12.
Finally, age and
acquisition is a process in which the individual has to select the best option
in order to communicate
effectively and have a good input .
