Theory 55/Blushing/Rate lens
Blush Onset Is Sympathetic
The claim
Blush onset speed is set by the rate of sympathetic outflow rather than by the intensity of the emotion.
01Mechanism
Vasodilation follows sympathetic firing; the rate at which it rises determines how quickly colour appears.
02Prediction
Onset should track outflow rate.
03Refutation
Onset tracking emotion intensity would remove the autonomic term.