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<div>In the forests of the Amazon, West Africa, and Asia, villagers
often beat on large drums to send messages miles away. While you may
think that the patterns are similar to Morse Code, they're actually
simplified versions of the villagers' spoken languages</div>
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<div>https://www.youtube.com/watch?v=_Hb2k03srs0</div>
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<div>The intervals between beats changed in length depending on the
sounds that followed each vowel. If a sound segment consisted of just
one vowel, the time after the beat was quite short. But if that vowel
was followed by a consonant, the time after the beat went up an
average of 80 milliseconds. Two vowels followed by a consonant added
another 40 milliseconds. And a vowel followed by two consonants added
a final 30 milliseconds.<br>
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<div>These short durations are enough to distinguish the drummed
messages for "go fishing" and "bring firewood," which are
identical in tone, but not in their ordering of consonants and vowels.
That means, the researchers write, that rhythm plays a crucial
expressive role in drummed languages.<br>
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<div
>http://www.sciencemag.org/news/2018/04/if-you-listen-closely-drumbea<span
></span>ts-amazonian-tribes-sound-human-speech</div>
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