The Eyes Have It: The Evolution of Eye-Gaze Signaling in Humans

Published on October 11, 2022

Just like how a bright neon sign catches your attention from across the street, the human eye has evolved to stand out among other primates. Recent research has sparked some doubts about the long-held theory that our uniformly white sclera, or the whites of our eyes, evolved specifically for better communication with our fellow humans. However, when we take a closer look at the evidence, it becomes clear that our eye-gaze signaling does play a crucial role in conspecific communication. While there may be some important updates to the current understanding of this fascinating trait, it remains an essential part of our social interactions.

Scientists have observed that non-human primates have less visible sclera compared to humans, making our eyes a defining feature of our species. This unique characteristic allows others to easily follow our gaze and signals important information during social interactions. By exploring the underlying research on this topic, we can gain a deeper appreciation for the intricate ways in which evolution has shaped our anatomy and behavior. So, let’s delve into the fascinating world of eye-gaze signaling and learn more about the evolution of the human eye!

The human eye characteristically has exposed and uniformly white sclera, which is hypothesized to have evolved to enhance eye-gaze signaling for conspecific communication. Although recent studies have put this hypothesis into question, current morphological and experimental evidence supports its key premise, albeit with recommendations for critical updates.

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