One of the most profound questions in human history is when language—the foundation of our communication and culture—first emerged. A new genetic analysis suggests that the capacity for language in Homo sapiens likely existed at least 135,000 years ago, with evidence indicating its social use may have begun around 100,000 years ago.
While our species is estimated to be about 230,000 years old, pinpointing the emergence of language has proven difficult. Previous theories have relied on fossil records, anatomical studies, and archaeological artifacts. But a new study published in Frontiers in Psychology takes a different approach: tracing the geographic divergence of early human populations through genetic data.
The researchers, led by Shigeru Miyagawa of MIT and co-authored by a team including scholars from the American Museum of Natural History and universities in Brazil, Switzerland, and the U.S., argue that because all human populations today possess language, it must have already existed before these populations began to spread across the globe. “Every population branching across the globe has human language, and all languages are related,” Miyagawa explains. “That suggests the capacity for language must have been present before the first population split, which genomic data dates to around 135,000 years ago.”
The study draws on 15 genetic studies published over the past two decades, including analyses of Y-chromosome data, mitochondrial DNA, and full genomes. Together, these studies provide increasingly consistent estimates for when humans began dispersing from a single ancestral population. That timeline, the researchers argue, marks the latest possible point when humans must have already had the cognitive ability to develop language.
This new synthesis of genomic data builds on earlier surveys, but with the benefit of greater quantity and improved precision. As Miyagawa notes, “Now we have more studies, and a narrower time window. That allows us to make a stronger case.”
Miyagawa, a linguist, has long studied connections among diverse languages and believes all human languages share a common origin. In previous work, he identified shared linguistic structures between English, Japanese, and Bantu languages, supporting the view that language is a universal human trait.
Importantly, the study distinguishes between the physical ability to make sounds—a trait shared with other primates—and the unique human ability to combine vocabulary and grammar into an infinitely generative system. “Human language is qualitatively different,” says Miyagawa. “Words and syntax work together to create a complex structure that no other animal communication system has.”
This complexity, he argues, points to a cognitive foundation for language that may have existed before humans began using it to communicate. Language, he suggests, likely started as an internal system for organizing thought and only later evolved into a shared communication tool.
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Archaeological evidence supports this idea: around 100,000 years ago, signs of symbolic behavior—such as decorative markings and the use of ochre—begin to appear widely. These practices are uniquely human and suggest a cognitive leap. Co-author Ian Tattersall has long argued that language sparked symbolic thinking and transformed human behavior.
“Language was the trigger for modern human behavior,” Miyagawa says. “It encouraged people to learn from one another, spurring cultural innovations.”
However, the authors acknowledge that not all scholars agree on language’s central role. Some see symbolic behavior emerging gradually through a combination of tool use, social interaction, and environmental factors, with language being just one piece of a broader puzzle.
Still, Miyagawa believes studies like this bring us closer to understanding the emergence of language. “Our work is grounded in empirical genetic data,” he says. “We’re making progress toward a clearer picture of when and how this uniquely human trait began.”
The study was supported in part by the São Paulo Research Foundation, through the São Paulo Excellence Chair awarded to Miyagawa.
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