In 1962, Michel Siffre, a French explorer and scientist, embarked on a groundbreaking experiment to understand how the absence of external time cues affects human biological rhythms. By isolating himself 130 meters below the surface in the Scarasson cave of the Ligurian Alps without a watch, daylight, or any indication of time for two months, Siffre discovered that humans have internal clocks, laying the foundation for the field of chronobiology. Living in complete darkness, he relied on his body’s signals for sleep and eating, finding that his perception of time was significantly altered—experiencing minutes as if they were elongated. This experiment, and a subsequent six-month isolation in a Texas cave, revealed that in the absence of time cues, people could adjust to a 48-hour cycle. Siffre’s pioneering work has had profound implications, influencing NASA’s approach to astronaut health by providing insights into how isolation from external time references can impact memory and time perception. Michel Siffre’s dedication and findings have made him a legend in scientific circles, significantly advancing our understanding of human chronobiology.
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