Theory 58/Goosebumps/Rate lens
Piloerection Tracks Cooling Rate
The claim
Goosebumps appear at the rate of skin cooling rather than at a fixed temperature, so a fast draft triggers them where slow cooling does not.
01Mechanism
Thermoreceptors respond to the derivative; the reflex is driven by how fast the skin is losing heat.
02Prediction
Onset should track cooling rate.
03Refutation
Onset tracking temperature would remove the derivative.