Did Ancient Campfires “Reprogram” the Human Brain with Flickering Light and Red Wavelengths?

A University of St. Andrews-led research team proposed that red wavelengths of flickering light from early human campfires may have reprogrammed the human brain to enhance social and verbal communication, leading to modern language and storytelling behaviors. The study suggests that firelight, with its red wavelengths and flickering pattern, could have influenced brain development, potentially accelerating the evolution of complex verbal communication. Researchers examined the effects of sitting around a campfire, noting that the red light may have helped synchronize brain activity and fostered deeper social connections.

The study found that campfire light emits mostly red wavelengths, which are considered "uniquely suited" for human socializing and may have extended the day without negatively impacting sleep. The team also noted that firelight flickers, and neurons in the human brain synchronize with external flickering lights. This synchronization could have helped coordinate behavior among people gathered around the fire, promoting cooperation and communication. Additionally, firelight emits infrared wavelengths, which may have contributed to the reprogramming of the brain for complex verbal communication.

The research team's findings suggest that fire use may have played a key role in the development of complex language, but they also acknowledge that other factors, such as the evolution of brain structures and social environments, may have contributed. The study highlights the unique ability of humans to develop complex communication systems, despite the fact that other species share many of the same skills. The paper, titled "Firelight and the Origins of Spoken Language," was published in the Proceedings of the Royal Society.

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