Evolutionary Anthropology: Rhythm Crucial in Drummed Speech
How can an entire language be mapped onto beats on two drums? To answer this question, an international team of researchers, including Frank Seifart and Sven Grawunder of the former Department of Linguistics at the Max Planck Institute for Evolutionary Anthropology in Leipzig and Julien Meyer from the Université Grenoble Alpes in France carried out research into the drummed speech system of the Bora people of the Northwest Amazon. What they found was that the Boras not only reproduce the melody of words and sentences in this endangered language, but also their rhythm. This suggests the crucial role of linguistic rhythm in language processing has been underestimated.
Credit: © Gaiamedia/ Aexcram
The human voice can produce rich and varied acoustic signals to transmit information. Normally, this transmission only has a reach of about 200 metres. The Boras, an indigenous group of about 1,500 members residing in small communities in the Amazonian rainforest of Colombia and Peru, can extend this range by a factor of 100 by emulating Bora phrases in sequences of drumbeats. The Boras do this with manguaré drums – pairs of wooden slit drums traditionally carved from single logs (each about two metres) through burning. Each drum can produce two pitches, a pair four in total.
The Boras use manguaré drums in two ways. One is the ‘musical mode’, which is used to perform memorised drum sequences with little or no variation as part of rituals and festivals. The other is the ‘talking mode’, which is used to transmit relatively informal messages and public announcements.
The Boras use drummed Bora to mimic the tone and rhythm of their spoken language and to elaborate Bora phrases in order to overcome remaining ambiguities. “Rhythm turns out to be crucial for distinguishing words in drummed Bora”, says Seifart. “There are four rhythmic units encoded in the length of pauses between beats. These units correspond to vowel-to-vowel intervals with different numbers of consonants and vowel lengths. The two phonological tones represented in drummed speech encode only a few lexical contrasts. Rhythm therefore appears to crucially contribute to the intelligibility of drummed Bora.”
This, the researchers argue, provides novel evidence for the role of rhythmic structures composed of vowel-to-vowel intervals in the complex puzzle concerning the redundancy and distinctiveness of acoustic features embedded in speech
Contacts and sources:
Frank Seifart, Julien Meyer, Sven Grawunder & Laure Dentel
Royal Society Open Science; 25 April, 2018 (DOI: 10.1098/rsos.170354)
Source: http://www.ineffableisland.com/2018/04/evolutionary-anthropology-rhythm.html
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