How did they discount genetic factors? We're the same tests performed on close relatives who were multilingual?
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I don’t know about this study, but we have other linguistic examples of this. From Homer we get the wine-dark sea and I think I’ve read other things talking specificallt about blue being a late-emerging distinct color in a lot of languages.
I've read similar, but the question surrounding a genetic component seems to have gone unanswered throughout. There's a strong correlation between genetics and language, especially ancient ones, given the relative isolation. How do we know that these languages don't just largely reflect what the speakers could physically see?
Basic Color Terms: Their Universality and Evolution (1969; ISBN 1-57586-162-3) is a book by Brent Berlin and Paul Kay. Berlin and Kay's work proposed that the basic color terms in a culture, such as black, brown, or red, are predictable by the number of color terms the culture has.
Berlin and Kay posit seven levels in which cultures fall, with Stage I languages having only the colors black (dark–cool) and white (light–warm). Languages in Stage VII have eight or more basic color terms. This includes English, which has eleven basic color terms. The authors theorize that as languages evolve, they acquire new basic color terms in a strict chronological sequence; if a basic color term is found in a language, then the colors of all earlier stages should also be present. The sequence is as follows:
Stage I: Dark-cool and light-warm (this covers a larger set of colors than just English "black" and "white".)
Stage II: Red
Stage III: Either green or yellow
Stage IV: Both green and yellow
Stage V: Blue
Stage VI: Brown
Stage VII: Purple, pink, orange, or gray