Newborn Chicks Connect Sounds With Shapes Just Like Humans, Study Finds

In a discovery that is ruffling feathers in the scientific community, researchers have found that baby chicks can associate certain sounds with specific shapes—just like humans do. This revelation, detailed in a new study published today in Science, challenges long-held beliefs about the origins of language and suggests that our ability to connect sounds to meanings may not be as uniquely human as once thought.

For over a century, scientists have been fascinated by the bouba-kiki effect, a phenomenon where people instinctively associate the soft, rounded sound of “bouba” with curvy, circular shapes, and the sharp, angular sound of “kiki” with spiky, jagged forms. This universal intuition has been considered a potential clue to how early humans might have developed language, linking sounds to meanings in a way that felt natural and instinctive.

But now, a team of researchers led by Maria Loconsole, a comparative psychologist at the University of Padua in Italy, has turned this theory on its head. By testing baby chicks—animals that are separated from humans by over 300 million years of evolution—the team discovered that these young birds also exhibit the bouba-kiki effect. This suggests that the ability to associate sounds with shapes may be far more ancient and widespread than previously believed.

The Experiment

The study involved placing newly hatched chicks in front of two panels: one featuring a flower-like shape with gentle, rounded curves, and the other displaying a spiky, explosion-like blotch. The researchers then played recordings of humans saying either “bouba” or “kiki” and observed the chicks’ behavior.

The results were striking. When the chicks heard “bouba,” 80% of them approached the round shape first, spending an average of more than three minutes exploring it. In contrast, they spent less than a minute investigating the spiky shape. The preferences were reversed when the chicks heard “kiki,” with the majority gravitating toward the spiky shape.

What This Means for Language Theory

The implications of this study are profound. Because the tests were conducted within the chicks’ first hours of life, outside the influence of their environment, the researchers concluded that this sound-shape association is likely innate. This challenges the idea that the bouba-kiki effect is a uniquely human trait tied to the evolution of language.

Aleksandra Cwiek, a linguist at Nicolaus Copernicus University in Toruń, Poland, who was not involved in the study, called the findings “mind-blowing.” She noted that humans and birds diverged on the evolutionary tree 300 million years ago, yet both species share this perceptual bias.

A New Perspective on Language Origins

This discovery raises intriguing questions about the origins of language. If the ability to associate sounds with shapes is not unique to humans, then what role did it play in the development of human language? Did our ancestors build their first words on these instinctive associations, or is there another explanation for the emergence of language?

The study also highlights the importance of studying other species to better understand human cognition. By looking beyond ourselves, we may uncover fundamental principles of perception and communication that have been shaped by millions of years of evolution.

The Broader Implications

Beyond its impact on language theory, this research has broader implications for our understanding of animal cognition. It suggests that even seemingly simple creatures like baby chicks possess complex perceptual abilities that were previously thought to be exclusive to humans.

This finding could also influence how we approach the study of other species, encouraging scientists to explore the cognitive capabilities of animals in new and unexpected ways. As we continue to unravel the mysteries of the mind, studies like this remind us that the line between human and animal cognition may be thinner than we once believed.

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This groundbreaking study not only challenges our understanding of language but also opens up new avenues for exploring the cognitive abilities of animals. As scientists continue to investigate these fascinating connections, one thing is clear: the story of language—and cognition—is far more complex and interconnected than we ever imagined.

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