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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
refutedsupported
the weight of evidence
2 sources for · 0 against

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

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 · cited by 10
Demonstrates that aspects like verbal inflectional synthesis adapt to the sociolinguistic environment, including the proportion of adult second language learners.
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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.

More for · 1
Macroevolutionary analysis of polysynthesis shows that language complexity is more likely to evolve in small, isolated populations.
2025 · cited by 2
Provides phylogenetically informed evidence that morphological complexity is less likely to occur in languages with high contact and more prone to loss.
The paper trail · every fact has a biography
first checked04 Aug 2026
judged → SUPPORTED · 8204 Aug 2026
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