Humans and chimpanzees both take part in rapid social exchanges, suggesting some foundational principles of language may have evolved earlier than previously thought
trade gestures at a rapid pace when socialising, similar to the rate at which humans engage in a back-and-forth conversation.) communities across East Africa, examining 8559 gestures made by 252 chimps – one of the largest studies of its kind. They recorded face-to-face interactions between the apes, noting the timing between one’s
Their analysis of the ape “conversations” revealed that the time between chimp signals was remarkably similar to human exchanges – even a bit faster. “On average, there are 120 milliseconds between the end of one gesture and the start of the next one,” saysat the University of St Andrews in the UK. “In humans, the average is around 200 milliseconds, so it’s really close timing.”
Although all the chimp communities used quick responses, the exact timing varied from group to group. For instance, the Sonso community of chimps in Uganda took a few milliseconds longer to return a gesture than the other chimpanzee communities in the study.conversation style than those who speak Danish. “We don’t know exactly why,” says Badihi. “As with humans, we don’t know if it’s a cultural difference, something we learn over time or a response to the environment.
“What is really exciting about this, is that it shows us that communication is a cooperative and socially engaging process in animals outside of humans,” says Badihi. “It could be that the processes involved in human language actually evolved much earlier than we thought.”
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