"In the early 1960s, a doctoral student at Cornell University wanted to figure out whether there was any truth behind the “cultural stereotype” that certain foreigners speak faster than Americans. He recorded 12 of his fellow students—six Japanese speakers and six American English speakers—monologuing about life on campus, analyzed one minute of each man’s speech, and found that the two groups produced sounds at roughly the same speed. He and a co-author concluded that “the hearer judges the speech rate of a foreign language in terms of his linguistic background,” and that humans the world over were all likely to be more or less equally fast talkers.
In the half century since then, more rigorous studies have shown that, prejudice aside, some languages—such as Japanese, Basque, and Italian—really are spoken more quickly than others. But as mathematical methods and computing power have improved, linguists have spent more time studying not just speech rate, but the effort a speaker has to exert to get a message across to a listener. By calculating how much information every syllable in a language conveys, it’s possible to compare the “efficiency” of different languages. And a study published today in Science Advances found that more efficient languages tend to be spoken more slowly. In other words, no matter how quickly speakers chatter, the rate of information they’re transmitting is roughly the same across languages."