During action observation without smell, subjects wore nostril-plugs to prevent awareness of odorant stimuli.
In the smelling-first condition, the subject smelled an odor first, read provided labels afterward, and then selected an answer.
Generally, it is not clear in which order odorants and the corresponding set of verbal descriptors/pictures in the Sniffin' Sticks (or any other) identification test should be presented should a subject smell an odor first and then read a list of descriptors, or should reading the list of possible answers be followed by odor presentation?
Test smells are the subject of active discussions among practitioners and researchers, and various guidelines to handle smells are constantly offered for smell prevention, smell detection, and smell correction.
The testing procedure was broken into multiple sessions, and in each session, the subject smelled the urine from a single subject (including one session in which they smelled their own urine).
Issues on the subject of "smell" and "taste" literally offered those opportunities to the readers.
In addition to the cause, the smell "Category" might be subject to a set of conditions (box on top of "Category", see Figure 2).
About 6% of subjects are unable to detect asparagus odor, and we ruled out generalized smell loss in these subjects by assessing their response to a second odorant.
(Before proceeding, it should be noted that this survey does not touch on the related subject of smells inside subway cars, which tend to be much more ephemeral and easy to pinpoint. A rider recently wrote of tracing a particularly foul odor to the man seated next to her, who smelled "like he just got back from a weeklong deep-sea fishing trip").
After a three-hour screening, subjects perform smell tests, reporting reactions verbally or by computer during successive visits.
