An investigation of the equiratio-mixture model in olfactory psychophysics: A case study

The psychophysical function of one olfactory equiratio-mixture type was examined in relation to the functions of its constituents, α-terpineol and 1-decanol. Suppression occurred over the entire concentration range used; that is, values predicted for the mixture by the equiratio mixture model were higher than those determined experimentally. The model consistently underestimated the intensities of the mixtures. The difference between the predicted and the experimentally obtained functions was probably caused by suppression at a central level.