The relationK=αlog(ψ+q/k) +β between category scaleKand magnitude scale ψ found in previous experiments on loudness and softness of white noise was confirmed for smell data, too. The small increase in variability (SDs) of judgments with magnitude for smell as compared with loudness and softness suggests the substitution of the prothetic‐metathetic dichotomy with a quantifiable feature, protheticness, with metathetic continua as the limiting