A recent study suggests they’ve got the voice but not the brains.
This article was originally published at The Conversation and has been republished under Creative Commons.
This suggests that the primate vocal tract is “speech ready” but that most species don’t have the neural control to make the complex sounds that comprise human speech. When reviewing the evidence in 1871, Charles Darwin wrote, “the brain has no doubt been far more important.”Along with Jeroen Smaers from Stony Brook University in New York, I have been investigating the relationship between the number of different calls that each primate species can make and the architecture of their brains.
We also found that apes have particularly large cortical association areas, as well as a bigger hypoglossal nucleus than other primates. The hypoglossal nucleus is associated with the cranial nerve that controls the muscles of the tongue. This suggests that our closest primate relatives may have finer and more voluntary control over their tongues than other primate species.
Research has shown that some primate species, such as vervet monkeys, use “words” to label things . Some species even combine calls into simple “sentences” . This can tell us a lot about the early evolution of language, and the elements of language that might have already been present in our common ancestors with these species some millions of years ago.
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