Cognitive Connie
Understanding language development in early childhood
Early childhood (3–6 years) is the period in which language becomes grammatically structured in the full sense. The child is no longer limited to telegraphic utterances; they now command the morphological rules of their language, produce complex multi-clause sentences, participate in extended narrative discourse, and begin to reflect on language itself. By the end of the preschool years, in any normal linguistic environment, the child's grammar is essentially adult-like in its core structural properties — a pace of grammatical acquisition that remains one of the most impressive and least fully explained facts about human development.
Key figures
Lev Vygotsky
1896–1934Theorised private speech as the mechanism by which social language is internalised as cognitive self-regulation. His account of the developmental relationship between language and thought has been particularly influential in understanding preschool language and cognition.
Roger Brown
1925–1997Documented the consistent acquisition order of 14 English grammatical morphemes and proposed that this order reflects semantic and grammatical complexity — not input frequency — providing key evidence against simple reinforcement accounts of language learning.
Dan Slobin
1939–2017Cross-linguistic developmental psycholinguist who proposed the Language-Making Capacity — a set of cognitive and perceptual strategies children use to discover the grammar of their language. Showed that children's acquisition patterns vary systematically with typological features of their language.
Key concepts
Grammatical Morphemes
Small units of meaning — inflections, prepositions, articles — attached to words or added between words. Roger Brown documented 14 English grammatical morphemes that are acquired in a consistent order across children: the order correlates with semantic and grammatical complexity, not input frequency.
Overgeneralisation
The application of a grammatical rule to forms that are exceptions — producing "goed," "mouses," "foots," or "breaked." Overgeneralisation errors are evidence that children have extracted an abstract rule and apply it productively. They peak in the preschool years and are absent in children who acquire only by rote imitation — making them one of the clearest pieces of evidence against pure imitation accounts of language learning.
Syntactic Development
The acquisition of rules governing sentence structure: word order, clause embedding, relative clauses, passives. In early childhood, children master basic SVO order and then progressively acquire more complex structures. English passives (e.g., "the cat was chased by the dog") are late acquisitions, typically not fully understood until age 5–7.
Narrative Competence
The ability to produce a structured, coherent account of a temporally and causally organised sequence of events. Develops substantially from 3 to 6 years: early narratives are simple sequences ("and then... and then...") while later narratives include a classic story grammar structure. Closely linked to theory of mind and is a strong predictor of reading comprehension.
Wh-Questions
Questions beginning with "who," "what," "where," "when," "why," and "how" require subject-auxiliary inversion and other syntactic operations. Children acquire "what" and "where" questions first, followed by "who," "when," "how," and "why" in a consistent cross-linguistic order that reflects the cognitive complexity of the question type rather than input frequency.
Private Speech
Audible self-directed speech produced while working on tasks. Vygotsky argued that private speech is not egocentric immaturity but the internalisation of social language as a cognitive self-regulation tool. Peaks in the preschool years at intermediate task difficulty and progressively internalises into silent inner speech. Closely related to working memory and executive function development.
Test your knowledge
Sources
Last reviewed July 2025- 1.
Brown R. (1973). A First Language: The Early Stages. Harvard University Press.
+About this source
The canonical documentation of morpheme acquisition order and early syntactic development.
- 2.
Slobin D.I. (1985). The Crosslinguistic Study of Language Acquisition. Lawrence Erlbaum.
+About this source
Cross-linguistic evidence for universal and language-specific patterns in grammatical acquisition.