Research in Spain uncovers a sudden structural shift in early childhood syntax around age two years and two months, challenging the view of gradual language development and offering new insights into atypical language trajectories.
Researchers in Spain have mapped how syntax develops in early childhood and found that the structure of children’s language does not change gradually, but appears to shift sharply around the age of two years and two months. The study, published in Physical Review Research, was led by the Institute of Evolutionary Biology, or IBE, and the Health Research Institute of the Balearic Islands, with help from IFISC.
To build the model, the team analysed 142 spontaneous Dutch-language speech sessions from the CHILDES database. That sample included 82 children with typical development and 60 children with atypical development, including Down syndrome, hearing impairment and specific language disorder. Each sentence was turned into a dependency tree, then combined into a network in which words became nodes and syntactic links became connections, allowing the researchers to track 18 different features of each session.
The result was a picture of language growth as a staged process. At first, the syntax networks resembled simple chains, but they later became denser, more interconnected and organised around central syntactic hubs. The researchers say the shift amounts to a kind of structural “jump” in the language network, echoing earlier work that also found a sharp transition in syntax around the age of two.
The study also suggests that children with atypical development often follow the same broad route as their peers, but may stop short of the later stages of that progression. The authors say the approach could one day help clinicians describe language trajectories more precisely, although they stress that it still needs further validation. They also argue that comparing these developmental stages across more languages and populations could shed light on how human language itself evolved.
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