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Is language acquisition innate?
Children learn language astonishingly fast, which has led many researchers to argue that part of this ability is innate. The real debate is about how much is built in, and what kind of knowledge it is.
What “innate” can mean
- A biological capacity for language. Humans are equipped to learn language in a way no other species is. Almost nobody disputes this.
- Specific built-in grammatical knowledge. This is the idea of Universal Grammar: abstract principles of grammar that children bring to the task. This stronger claim is contested.
The nativist case
Noam Chomsky (1959) argued in his review of B. F. Skinner that imitation and reward cannot explain how children produce sentences they have never heard. He proposed a Language Acquisition Device (Chomsky, 1965) and the poverty of the stimulus argument: the language children hear seems too limited, and too free of explicit correction, to account on its own for the grammar they end up with. Eric Lenneberg (1967) added a biological view, including the idea of a critical period for acquisition.
Evidence often cited
| Evidence | What it shows | Caution |
|---|---|---|
| Similar milestones across cultures | Babbling in the first year, first words around 12 months, word combinations from about 18–24 months | Timing varies widely between healthy children |
| Nicaraguan Sign Language | Deaf children brought together in new schools created a sign language, and later cohorts added grammatical structure (Senghas et al., 2004) | Shows learners shape language; not what is genetic |
| Late learners of sign language | Deaf people who learn a sign language later in life tend to reach lower ultimate proficiency (Newport, 1990) | Age effects may reflect experience as well as biology |
| The KE family and FOXP2 | A mutation was linked to a severe speech and language disorder (Lai et al., 2001) | FOXP2 is not “the language gene”; it affects many aspects of development |
The usage-based alternative
Michael Tomasello (2003) and others argue that children can learn language from the input using general abilities: reading other people’s intentions, finding patterns and gradually building a repertoire of constructions. Studies of statistical learning support this. Eight-month-old infants listening to a stream of made-up words picked out the word boundaries from the patterns in the sounds after only two minutes of listening (Saffran et al., 1996). Learning from input clearly works; the question is whether it works without any language-specific head start.
Where most researchers land
Most accept that both biology and experience matter. Children need a human brain adapted for learning and also a rich language environment. The remaining disagreement is whether the biological part includes detailed grammatical knowledge or a more general learning machinery.
Why it matters in therapy
- Developmental language disorder affects roughly 7% of children (Tomblin et al., 1997), which shows that the biological capacity does not develop equally in everyone.
- Either view supports giving children plenty of responsive talk, because input is needed whatever is innate.
- Learning more than one language does not cause language disorder. A bilingual child’s total vocabulary across both languages is the fairer comparison.
Remember. “It is innate” and “it is learned” are not opposites. The interesting questions are what is innate and how it interacts with experience.
Sources and further reading
- Chomsky, N. (1959). A review of B. F. Skinner’s Verbal Behavior. Language, 35(1), 26–58.
- Chomsky, N. (1965). Aspects of the Theory of Syntax. MIT Press.
- Lenneberg, E. H. (1967). Biological Foundations of Language. Wiley.
- Newport, E. L. (1990). Maturational constraints on language learning. Cognitive Science, 14(1), 11–28.
- Saffran, J. R., Aslin, R. N., & Newport, E. L. (1996). Statistical learning by 8-month-old infants. Science, 274, 1926–1928.
- Senghas, A., Kita, S., & Özyürek, A. (2004). Children creating core properties of language: Evidence from an emerging sign language in Nicaragua. Science, 305, 1779–1782.
- Tomasello, M. (2003). Constructing a Language: A Usage-Based Theory of Language Acquisition. Harvard University Press.
- Lai, C. S. L., et al. (2001). A forkhead-domain gene is mutated in a severe speech and language disorder. Nature, 413, 519–523.
- Tomblin, J. B., et al. (1997). Prevalence of specific language impairment in kindergarten children. Journal of Speech, Language, and Hearing Research, 40(6), 1245–1260.