The hunter-gatherers from the upper reaches of the Sepik River in Papua New Guinea do not distinguish between blue and green but their language contains a sharp contrast between two hues of yellow, "nol" and "wol" not found in English.
Scientists from Goldsmiths College in London, compared the way the Berinmo perceived colours compared to a sample group of English speakers. The Berinmo were better able topick a colour from a choice of hues around the "nol-wol" boundary than around the blue-green boundary. A comparison group of English speakers showed the reverse tendency.
Writing in the journal Nature yesterday the scientists said: "Our results from these experiments are consistent with there being a considerable degree of linguistic influence on colour categorisation."