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In page Proto-Human language:
"The concept is speculative and not amenable to analysis in historical linguistics. It presupposes a monogenetic origin of language, that is, the derivation of all natural languages from a single origin, presumably at some time in the Middle Paleolithic period. As the predecessor of all extant languages spoken by modern humans (Homo sapiens), Proto-Human as hypothesized would not necessarily be ancestral to any hypothetical Neanderthal language.[citation needed]
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