Discriminating parts from the whole: determinants of odor mixture perception in squirrel monkeys,Saimiri sciureus

In a task designed to simulate olfactory-guided foraging, the ability of squirrel monkeys to discriminate an artificial 12-component odorant from 3-, 6-, 9- or 11- component submixtures was investigated. A combination of factors was found to contribute to the animals' performance:

1.	Discriminability generally decreased as the number of components in the submixture increased.
2	Submixtures did not contribute equally to mixture perception, and one component in particular (cineole) disproportionately influenced stimulus discriminability.
3.	Interactive effects between submixtures resulted in marked deviations from the general pattern of discriminability.
4.	Changes in the relative concentration of submixtures could also influence discriminability.
5.	Finally, individual differences in responsiveness to particular stimuli were apparent.