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the claim

Second language acquisition drives the loss of complex grammatical features in languages.

the verdict
SUPPORTED
the evidence backs this
Recorded sources
2 sources for · 0 against

Counts group repeated records of the same source within each side. They do not measure evidence strength or source independence.

Is it true that second language acquisition drives the loss of complex grammatical features in languages?

Yes. Evidence indicates that second language acquisition and high language contact contribute to the reduction of complex morphological features in languages.

Verdict: SUPPORTED · 2 sources for, 0 against · Last checked

The analysis

The retrieved papers include typological and macroevolutionary studies (such as indices 2 and 7) examining how sociolinguistic environments and adult second language learners impact linguistic structures, finding that certain complex morphological features tend to adapt or be lost in high-contact or high-L2 environments. The other papers are off-topic clinical or medical studies.

Evidence for · 2
Language Structures May Adapt to the Sociolinguistic Environment, but It Matters What and How You Count: A Typological Study of Verbal and Nominal Complexity.
2018
Demonstrates that aspects like verbal inflectional synthesis adapt to the sociolinguistic environment, including the proportion of adult second language learners.
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K, S. & F, D. G. (2018). Language Structures May Adapt to the Sociolinguistic Environment, but It Matters What and How You Count: A Typological Study of Verbal and Nominal Complexity.. doi.org. https://doi.org/10.3389/fpsyg.2018.01141

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More for · 1
Macroevolutionary analysis of polysynthesis shows that language complexity is more likely to evolve in small, isolated populations.
2025
Provides phylogenetically informed evidence that morphological complexity is less likely to occur in languages with high contact and more prone to loss.
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L, B., K, Y., O, W., & X, H. (2025). Macroevolutionary analysis of polysynthesis shows that language complexity is more likely to evolve in small, isolated populations.. doi.org. https://doi.org/10.1073/pnas.2504483122

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What does the evidence say?

The retrieved papers include typological and macroevolutionary studies (such as indices 2 and 7) examining how sociolinguistic environments and adult second language learners impact linguistic structures, finding that certain complex morphological features tend to adapt or be lost in high-contact or high-L2 environments. The other papers are off-topic clinical or medical studies.

Receipt History
first checked04 Aug 2026
judged → SUPPORTED · 8204 Aug 2026
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