Theory 71/Taste/Threshold lens
Detection Is a Genetic Threshold
The claim
Whether a compound tastes bitter is set by a threshold in receptor sensitivity, so the same molecule is tasteless to one person and overwhelming to another.
01Mechanism
Detection requires enough receptor occupancy to cross a central threshold; sensitivity varies genetically.
02Prediction
Detection should track receptor sensitivity.
03Refutation
Detection tracking concentration alone would remove the genetic term.