In a dark room, a human being does not look like a firefly. However, reactions associated with metabolism can produce extremely low light emission. Its intensity is well below what our eyes directly distinguish.
A study published in 2009 used a very sensitive camera to record this spontaneous emission and its variations during the day in participants. The authors distinguish it from a simple image of heat: these are photons detected in another type of measurement.
The phenomenon does not validate accounts of visible auras or particular powers. Rather, it shows the difference between what exists and what our senses allow to perceive. We often imagine the luminous body only when a lamp illuminates it; the instruments also reveal a much more discreet emission, produced by its own functioning.
What we know
Ultra-low emission measured in a protocol; no perceptible, diagnostic or equivalence with a thermal camera.
To go to the source
References consulted on September 21, 2026. Linked pages may be in another language.
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