April 16th - April 16th, 2008 Today: Critical period...

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April 16 th , 2008 Today: Critical period hypothesis ‘Genie’ Language and intelligence Stages of acquisition (review) -all (normal) children go through same stages of acquisition in same order -age at which they reach stage and rate of progression varies “Predestinate grooves” -Aitchison: The fact that the stages are universal suggests that language acquisition is on a biological time clock Critical period hypothesis for language: Eric Lenneberg (1960s) -There is a specific period of time (from about age 2 until puberty) when language is best acquired; after this period, normal language acquisition can’t take place -Critical periods in animals *visual development in kittens *bird songs Evidence: -Brain plasticity *children, but not adults, can recover fully from severe left hemisphere damage --younger children recover more completely than older children Additional evidence: -Deaf exposed to sign language in adulthood vs. childhood -Adult immigrants vs. their children -Pidgins vs. creoles
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April 16th - April 16th, 2008 Today: Critical period...

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