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The Holy Shiver | Radiolab Podcast

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166 views8likes38:03RadiolabpodOriginal Release: 2026-07-18

Goosebumps (piloerection) originate from the arrector pili muscle, which evolved around 200 million years ago to help mammals trap warm air and appear larger when threatened. While this survival reflex is largely vestigial in humans, it has been co-opted for emotional responses. Scientists at the Institute for Advanced Consciousness Studies discovered that 'aesthetic chills' occur when deeply held beliefs about how the world works are challenged, representing a moment of cognitive recalibration. Their research identified 300 stimuli that reliably induce chills and developed a personalized 'chills machine' that can predict which content will trigger goosebumps in individuals with 73.5% accuracy. This phenomenon may serve as a biological signal to pay attention to meaningful experiences and could potentially be used therapeutically for conditions like depression.