Listen closely to those baboon calls. They may tell you a thing or two about human speech. Scientists who studied baboons’ wahoos, yaks, barks and other vocalizations have found evidence of five vowel ...

IT has been known for some time that vowels are distinguished from one another mainly by the frequencies of the formants or regions of the auditory spectrum in which there is a comparatively large ...

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Professor William Labov, a University of Pennsylvania linguist and author of the new book Atlas of North American English Phonetics, Phonology and Sound Change, says there is a shift of vowel sounds ...