1. A method for determining emotional response to olfactory stimuli presented to a test subject during an emotional response test, the method comprising: analyzing respiration cycle information associated with the test subject to determine a respiration pattern that includes inhalation and exhalation portions of the test subject's respiration cycle; determining, based at least in part on the respiration cycle information, a time at which an olfactory stimulus should be triggered for release to reach the test subject's nose at a predetermined time, the predetermined time corresponding to an inhalation portion of the test subject's respiration cycle or to a projected time at which the test subject will be in an inhalation portion of the respiration cycle; controllably releasing the olfactory stimulus at the determined time; collecting eye data from the test subject while the test subject is presented with the released olfactory stimulus, the eye data including pupil data, blink data, and gaze data; analyzing the collected eye data to determine the test subject's emotional response to the olfactory stimulus.