Figure 1.

Theoretical psychometric functions for single flavorants (gustatory, olfactory) presented alone (lower curve in each pair) and together as a mixture (upper curve in each pair). Detection of the mixture is calculated from a model of PS that assumes high thresholds (negligible noise). The slopes of the functions are shallower in the pair on the right than the pair on the left, thereby producing a greater difference between the thresholds for single components and their mixture (horizontal separation).