“Speakers of some languages seem to rattle away at high speed like machine-guns, while other languages sound rather slow and plodding,” wrote linguist Peter Roach in 1998. A few months ago re­searchers systematically quantified Roach’s observation and offered a sur­prising explanation. Last year, in an issue of the journal Language, François Pel­legrino and his colleagues at the Univer­sity of Lyon in France published their analysis of the speech of 59 people read­ing the same 20 texts aloud in seven languages. They found Japanese and Spanish, often described as “fast lan­guages,” clocked the greatest number of syllables per second. The “slowest” language in the set was Mandarin, followed closely by German.





But the story does not end there. The researchers also calculated the infor­mation density for the syllables of each language by comparing them with an eighth language, Vietnamese, which served as an arbitrary reference. They found that an average Spanish syllable conveys only a small quantity of infor­mation, contributing just a fragment to the overall meaning of a sentence. In contrast, an individual Mandarin sylla­ble contains a much larger quantity of information, possibly because Mandarin syllables in­clude tones. The upshot is that Spanish and Mandarin actually convey information to listeners at about the same rate. The correlation between speech rate and information density held for five out of seven of the lan­guages studied, and the researchers conjectured that, despite the diversity of languages in the world, over time they all deliver a constant rate of information, possibly tuned to the human perceptual system.

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