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the claim
Nicaraguan Sign Language is the only known natural language to emerge entirely de novo without a prior input.
the verdict
SUPPORTED
the evidence backs this
refutedsupported
the weight of evidence
3 sources for · 0 against

Nicaraguan Sign Language is widely documented in the literature as a unique case of a natural language emerging de novo among deaf individuals without prior linguistic input, rapidly developing complex grammatical structures across successive cohorts.

Evidence for · 3
2001 · cited by 299
Paper [0] confirms that Nicaraguan Sign Language emerged from a group of deaf individuals without prior exposure to a developed language, documenting its de novo creation.
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The analysis

The retrieved papers consistently support the premise that Nicaraguan Sign Language arose de novo from groups lacking a prior language model, confirming its unique status as a spontaneously emerging natural sign language. No papers refute this claim.

More for · 2
2010 · cited by 11
Paper [7] analyzes the grammar and spatial devices of Nicaraguan Sign Language emerging since the late 1970s without prior linguistic input.
2023 · cited by 3
Paper [11] explicitly states that Nicaraguan Sign Language emerged in the last 40 years and is not derived from any existing language.
The paper trail · every fact has a biography
first checked05 Aug 2026
judged → SUPPORTED · 9005 Aug 2026
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