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> This paper analyzes and shows how limited are monkey vocal calls:
> 
> https://phys.org/news/2019-09-world-monkeys-combine-items-speechbut.html
> 
> "The utterances of Old World monkeys, some of our primate cousins, may be more sophisticated than previously realized—but even so, they display constraints that reinforce the singularity of human language, according to a new study co-authored by an MIT linguist. 
> 
> "The study reinterprets evidence about primate language and concludes that Old World monkeys can combine two items in a language sequence. And yet, their ability to combine items together seems to stop at two. The monkeys are not able to recombine language items in the same open-ended manner as humans, whose languages generate an infinite variety of sequences.
> 
> "We are saying the two systems are fundamentally different," says Shigeru Miyagawa, an MIT linguist and co-author of a new paper detailing the study's findings.
> 
> "That might seem apparent. But the study's precise claim—that even if other primates can combine terms, they cannot do so in the way humans do—emphasizes the profound gulf in cognitive ability between humans and some of our closest relatives.
> 
> "'If what we're saying in this paper is right, there's a big break between two [items in a sentence], and [the potential for] infinity," Miyagawa adds. "There is no three, there is no four, there is no five. Two and infinity. And that is the break between a nonhuman primate and human primates."
> 
> "To conduct the study, Miyagawa and Clarke re-evaluated recordings of Old World monkeys, a family of primates with over 100 species, including baboons, macaques, and the probiscis monkey.
> 
> The language of some of these species has been studied fairly extensively. Research starting in the 1960s, for example, established that vervet monkeys have specific calls when they see leopards, eagles, and snakes, all of which requires different kinds of evasive action. 
> 
> "Similarly, tamarin monkeys have one alarm call to warn of aerial predators and one to warn of ground-based predators.
> 
> "In other cases, though, Old World monkeys seem capable of combining calls to create new messages. The putty-nosed monkey of West Africa, for example, has a general alarm call, which scientists call "pyow," and a specific alarm call warning of eagles, which is "hack." 
> 
> "Sometimes these monkeys combine them in "pyow-hack" sequences of varying length, a third message that is used to spur group movement.
> 
> "To conduct the study, Miyagawa and Clarke re-evaluated recordings of Old World monkeys, a family of primates with over 100 species, including baboons, macaques, and the probiscis monkey.
> 
> "The language of some of these species has been studied fairly extensively. Research starting in the 1960s, for example, established that vervet monkeys have specific calls when they see leopards, eagles, and snakes, all of which requires different kinds of evasive action. Similarly, tamarin monkeys have one alarm call to warn of aerial predators and one to warn of ground-based predators.
> 
> "In other cases, though, Old World monkeys seem capable of combining calls to create new messages. The putty-nosed monkey of West Africa, for example, has a general alarm call, which scientists call "pyow," and a specific alarm call warning of eagles, which is "hack."
>  
> Sometimes these monkeys combine them in "pyow-hack" sequences of varying length, a third message that is used to spur group movement.
> 
> ***
> 
> "As a result, Miyagawa adds, "Yes, those calls are made up of two items. Looking at the data very carefully it is apparent. The other thing that is apparent is that they cannot combine more than two things. We decided there is a whole different system here," compared to human language.
> 
> ***
> 
> "'It's not the human system," Miyagawa says. In the paper, Miyagawa and Clarke contend that the monkeys' ability to combine these terms means they are merely deploying a "dual-compartment frame" which lacks the capacity for greater complexity.
> 
> Miyagawa also notes that when the Old World monkeys speak, they seem to use a part of the brain known as the frontal operculum. Human language is heavily associated with Broca's area, a part of the brain that seems to support more complex operations.
> 
> "If the interpretation of Old World monkey language that Miyagawa and Clarke put forward here holds up, then humans' ability to harness Broca's area for language may specifically have enabled them to recombine language elements as other primates cannot—by enabling us to link more than two items together in speech.
> 
> ***
> 
> "'There's been all this effort to teach monkeys human language that didn't succeed," Miyagawa notes. "But that doesn't mean we can't learn from them.'" 
> 
> Comment:  We are different in kind  to the point that we use a different area of the brain for speech. How did brain cell committees (from dhw) plan that move?