The bouba-kiki effect: Baby chicks match sounds to shapes just like humans
Phys.org
February 20, 2026
AI-Generated Deep Dive Summary
The bouba-kiki effect highlights an intriguing connection between sound and shape perception, where humans and even baby chicks tend to associate certain sounds with specific shapes. For instance, sharp-sounding words like "bouba" are often linked to jagged or pointed shapes, while softer, rolling sounds like "kiki" are associated with rounded forms. This phenomenon, first observed in the 1920s but recently studied in chicks, suggests a fundamental human trait tied to cognitive development and sensory perception.
The effect was famously tested by psychologist Wolfgang Köhler, who found that people consistently paired certain syllables with particular shapes, regardless of cultural background. More recent research has expanded on this, showing that baby chicks exhibit similar preferences, reinforcing the idea that this connection is innate rather than learned. This suggests a deep-seated link between sound and shape perception, possibly rooted in evolution.
Understanding the bouba-kiki effect matters because it sheds light on how humans process sensory information and make sense of the world. It also raises questions about how language and cognition interact, particularly in early development. For scientists studying perception, this phenomenon offers insights into the origins of human thought and communication, potentially informing fields like linguistics, cognitive psychology, and even artificial intelligence design.
Overall, the bouba-kiki effect is a fascinating window into the way our brains process sensory input and connect abstract concepts. Its implications for understanding human cognition
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Originally published on Phys.org on 2/20/2026