A critical period for second language acquisition: Evidence from 2/3 million English speakers

Children learn language more easily than adults, though when and why this ability declines have been obscure for both empirical reasons (underpowered studies) and conceptual reasons (measuring the ultimate attainment of learners who started at different ages cannot by itself reveal changes in underl...

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Published in:Cognition Vol. 177; pp. 263 - 277
Main Authors: Hartshorne, Joshua K., Tenenbaum, Joshua B., Pinker, Steven
Format: Journal Article
Language:English
Published: Netherlands Elsevier B.V 01.08.2018
Elsevier Science Ltd
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ISSN:0010-0277, 1873-7838, 1873-7838
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Abstract Children learn language more easily than adults, though when and why this ability declines have been obscure for both empirical reasons (underpowered studies) and conceptual reasons (measuring the ultimate attainment of learners who started at different ages cannot by itself reveal changes in underlying learning ability). We address both limitations with a dataset of unprecedented size (669,498 native and non-native English speakers) and a computational model that estimates the trajectory of underlying learning ability by disentangling current age, age at first exposure, and years of experience. This allows us to provide the first direct estimate of how grammar-learning ability changes with age, finding that it is preserved almost to the crux of adulthood (17.4 years old) and then declines steadily. This finding held not only for “difficult” syntactic phenomena but also for “easy” syntactic phenomena that are normally mastered early in acquisition. The results support the existence of a sharply-defined critical period for language acquisition, but the age of offset is much later than previously speculated. The size of the dataset also provides novel insight into several other outstanding questions in language acquisition.
AbstractList Children learn language more easily than adults, though when and why this ability declines have been obscure for both empirical reasons (underpowered studies) and conceptual reasons (measuring the ultimate attainment of learners who started at different ages cannot by itself reveal changes in underlying learning ability). We address both limitations with a dataset of unprecedented size (669,498 native and non-native English speakers) and a computational model that estimates the trajectory of underlying learning ability by disentangling current age, age at first exposure, and years of experience. This allows us to provide the first direct estimate of how grammar-learning ability changes with age, finding that it is preserved almost to the crux of adulthood (17.4 years old) and then declines steadily. This finding held not only for “difficult” syntactic phenomena but also for “easy” syntactic phenomena that are normally mastered early in acquisition. The results support the existence of a sharply-defined critical period for language acquisition, but the age of offset is much later than previously speculated. The size of the dataset also provides novel insight into several other outstanding questions in language acquisition.
Children learn language more easily than adults, though when and why this ability declines have been obscure for both empirical reasons (underpowered studies) and conceptual reasons (measuring the ultimate attainment of learners who started at different ages cannot by itself reveal changes in underlying learning ability). We address both limitations with a dataset of unprecedented size (669,498 native and non-native English speakers) and a computational model that estimates the trajectory of underlying learning ability by disentangling current age, age at first exposure, and years of experience. This allows us to provide the first direct estimate of how grammar-learning ability changes with age, finding that it is preserved almost to the crux of adulthood (17.4 years old) and then declines steadily. This finding held not only for "difficult" syntactic phenomena but also for "easy" syntactic phenomena that are normally mastered early in acquisition. The results support the existence of a sharply-defined critical period for language acquisition, but the age of offset is much later than previously speculated. The size of the dataset also provides novel insight into several other outstanding questions in language acquisition.Children learn language more easily than adults, though when and why this ability declines have been obscure for both empirical reasons (underpowered studies) and conceptual reasons (measuring the ultimate attainment of learners who started at different ages cannot by itself reveal changes in underlying learning ability). We address both limitations with a dataset of unprecedented size (669,498 native and non-native English speakers) and a computational model that estimates the trajectory of underlying learning ability by disentangling current age, age at first exposure, and years of experience. This allows us to provide the first direct estimate of how grammar-learning ability changes with age, finding that it is preserved almost to the crux of adulthood (17.4 years old) and then declines steadily. This finding held not only for "difficult" syntactic phenomena but also for "easy" syntactic phenomena that are normally mastered early in acquisition. The results support the existence of a sharply-defined critical period for language acquisition, but the age of offset is much later than previously speculated. The size of the dataset also provides novel insight into several other outstanding questions in language acquisition.
Author Pinker, Steven
Hartshorne, Joshua K.
Tenenbaum, Joshua B.
AuthorAffiliation a Department of Brain & Cognitive Sciences, Massachusetts Institute of Technology, Building 46, 77 Massachusetts Avenue, MIT, Cambridge, MA 02139, United States
b Department of Psychology, Boston College, McGuinn Hall 527, Chestnut Hill, MA 02467, United States
c Department of Psychology, Harvard University, William James Hall 970, 33 Kirkland St., Cambridge, MA 02138, United States
AuthorAffiliation_xml – name: b Department of Psychology, Boston College, McGuinn Hall 527, Chestnut Hill, MA 02467, United States
– name: a Department of Brain & Cognitive Sciences, Massachusetts Institute of Technology, Building 46, 77 Massachusetts Avenue, MIT, Cambridge, MA 02139, United States
– name: c Department of Psychology, Harvard University, William James Hall 970, 33 Kirkland St., Cambridge, MA 02138, United States
Author_xml – sequence: 1
  givenname: Joshua K.
  surname: Hartshorne
  fullname: Hartshorne, Joshua K.
  email: Joshua.hartshorne@bc.edu
  organization: Department of Brain & Cognitive Sciences, Massachusetts Institute of Technology, Building 46, 77 Massachusetts Avenue, MIT, Cambridge, MA 02139, United States
– sequence: 2
  givenname: Joshua B.
  surname: Tenenbaum
  fullname: Tenenbaum, Joshua B.
  organization: Department of Brain & Cognitive Sciences, Massachusetts Institute of Technology, Building 46, 77 Massachusetts Avenue, MIT, Cambridge, MA 02139, United States
– sequence: 3
  givenname: Steven
  surname: Pinker
  fullname: Pinker, Steven
  organization: Department of Psychology, Harvard University, William James Hall 970, 33 Kirkland St., Cambridge, MA 02138, United States
BackLink https://www.ncbi.nlm.nih.gov/pubmed/29729947$$D View this record in MEDLINE/PubMed
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Keywords L2 acquisition
Language acquisition
Critical period
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Snippet Children learn language more easily than adults, though when and why this ability declines have been obscure for both empirical reasons (underpowered studies)...
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SubjectTerms Ability
Acquisition
Adults
Age
Age differences
Attainment
Children
Children & youth
Computer applications
Critical period
Early second language learning
English as a second language learning
English language
Grammar
L2 acquisition
Language
Language acquisition
Learning
Mathematical models
Native language acquisition
Second languages
Syntax
Title A critical period for second language acquisition: Evidence from 2/3 million English speakers
URI https://dx.doi.org/10.1016/j.cognition.2018.04.007
https://www.ncbi.nlm.nih.gov/pubmed/29729947
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