DEVICE: Sensonics' Snap & Sniff Eco-Friendly Olfactory Test System (G051SNST0)

Device Description: The Snap & Sniff® threshold test system was developed to provide scientists, clinicians, and others with a standardized, easy-to- use, and reliable means for assessing odor detection thresholds. In its standard form, the test employs the odorant phenyl ethyl alcohol (PEA), a stimulus with a rose-like smell at higher concentrations and little or no intranasal trigeminal nerve (CN V) reactivity. Other odorants, including n- butanol, ethyl acetate, guaiacol, pentyl (amyl) acetate, and phenyl ethyl methyl ethyl carbinol, are also available from Sensonics on a custom basis. The Snap & Sniff® threshold test kit is comprised of 20 smell “wands”. Five of these wands contain no odor, whereas the other wands contain, in the case of the standard odorant phenyl ethyl alcohol, half-log stimulus dilutions ranging from 10-2 (strongest) to 10-9 (weakest) concentrations. The odor of a given wand is contained within a cartridge similar to that of a felt-tip pen. When the thumb of the operator pushes forward on a slide mechanism, the odorized tip is exposed for sampling and presented to the subject. Releasing the slide retracts the odorized tip back into the wand’s housing. The Snap & Sniff® mechanism results in an easy presentation of an odorant to a subject. Because the odorant tip is presented only briefly, the odor is retained for much longer periods and can be used for testing many more subjects than devices lacking such sophisticated technology.