Linguistic ability and early language exposure. Mayberry, R. I, Lock, E., & Kazmi, H. Nature, 417(6884):38, 2002.
doi  abstract   bibtex   
For more than 100 years, the scientific and educational communities have thought that age is critical to the outcome of language learning, but whether the onset and type of language experienced during early life affects the ability to learn language is unknown. Here we show that deaf and hearing individuals exposed to language in infancy perform comparably well in learning a new language later in life, whereas deaf individuals with little language experience in early life perform poorly, regardless of whether the early language was signed or spoken and whether the later language was spoken or signed. These findings show that language-learning ability is determined by the onset of language experience during early brain development, independent of the specific form of the experience.
@Article{Mayberry2002,
  author   = {Rachel I Mayberry and Elizabeth Lock and Hena Kazmi},
  journal  = {Nature},
  title    = {Linguistic ability and early language exposure.},
  year     = {2002},
  number   = {6884},
  pages    = {38},
  volume   = {417},
  abstract = {For more than 100 years, the scientific and educational communities
	have thought that age is critical to the outcome of language learning,
	but whether the onset and type of language experienced during early
	life affects the ability to learn language is unknown. Here we show
	that deaf and hearing individuals exposed to language in infancy
	perform comparably well in learning a new language later in life,
	whereas deaf individuals with little language experience in early
	life perform poorly, regardless of whether the early language was
	signed or spoken and whether the later language was spoken or signed.
	These findings show that language-learning ability is determined
	by the onset of language experience during early brain development,
	independent of the specific form of the experience.},
  doi      = {10.1038/417038a},
  keywords = {Acoustic Stimulation, Adolescent, Adult, Age Factors, Aging, Auditory Perception, Brain, Child, Preschool, Deafness, Hearing, Human, Infant, Newborn, Language, Learning, Linguistics, Sign Language, 11986658},
}

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