Even though almost no one uses it? From David Robson at BBC:
The practice not only highlights humanity’s amazing linguistic diversity; it may also help us to understand the limits of human communication. In most languages, whistles are used for little more than calling attention; they seem too simple to carry much meaning. But Meyer has now identified more than 70 groups across the world who can use whistles to express themselves with all the flexibility of normal speech.
These mysterious languages demonstrate the brain’s astonishing capacity to decode information from new signals – with insights that are causing some neuroscientists to rethink the fundamental organisation of the brain. The research may even shed light on the emergence of language itself. According to one hypothesis, our first words may have sounded something like the Hmong’s courtship songs.More.
Everything about this Brit tax-funded garble is garbage except “the brain’s astonishing capacity to decode information from new signals… ” But it is not possible to talk honestly about that in a naturalist environment.
See also: Can we talk? Language as the business end of consciousness
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