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Title: Bonobos May Combine Words In Ways Previously Thought Unique To Humans

Link: https://science.slashdot.org/story/25/04/05/0...

A new study shows bonobos can combine vocal calls in ways that mirror human
language, producing phrases with meanings beyond the sum of individual
sounds. "Human language is not as unique as we thought," said Dr Melissa
Berthet, the first author of the research from the University of Zurich.
Another author, Dr Simon Townsend, said: "The cognitive building blocks that
facilitate this capacity is at least 7m years old. And I think that is a
really cool finding." The Guardian reports: Writing in the journal Science,
Berthet and colleagues said that in the human language, words were often
combined to produce phrases that either had a meaning that was simply the sum
of its parts, or a meaning that was related to, but differed from, those of
the constituent words. "'Blond dancer' -- it's a person that is both blond
and a dancer, you just have to add the meanings. But a 'bad dancer' is not a
person that is bad and a dancer," said Berthet. "So bad is really modifying
the meaning of dancer here." It was previously thought animals such as birds
and chimpanzees were only able to produce the former type of combination, but
scientists have found bonobos can create both. The team recorded 700
vocalizations from 30 adult bonobos in the Democratic Republic of the Congo,
checking the context of each against a list of 300 possible situations or
descriptions. The results reveal bonobos have seven different types of call,
used in 19 different combinations. Of these, 15 require further analysis, but
four appear to follow the rules of human sentences. Yelps -- thought to mean
"'et's do that" -- followed by grunts -- thought to mean "look at what I am
doing," were combined to make "yelp-grunt," which appeared to mean "let's do
what I'm doing." The combination, the team said, reflected the sum of its
parts and was used by bonobos to encourage others to build their night nests.
The other three combinations had a meaning apparently related to, but
different from, their constituent calls. For example, the team found a peep --
 which roughly means "I would like to ..." -- followed by a whistle --
appeared to mean "let's stay together" -- could be combined to create "peep-
whistle." This combination was used to smooth over tense social situations,
such as during mating or displays of prowess. The team speculated its meaning
was akin to "let's find peace." The team said the findings in bonobos,
together with the previous work in chimps, had implications for the evolution
of language in humans, given all three species showed the ability to combine
words or vocalizations to create phrases.

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