The act seems simple enough: to breathe in a scent, discover a fragrance, evaluate an odor. Yet, in the world of sensory analysis, having someone smell a product is far from a trivial exercise.
To obtain usable and representative data, a sniff test cannot be improvised. It relies on a meticulously planned protocol where every detail counts. Here's a look behind the scenes of a successful odor test and the key elements that guarantee the reliability of your results.
1. The Panel: The human measuring instrument
It all starts with the selection of participants. A good panelist must be in optimal physical condition. Beyond availability and concentration, we ensure a genuine olfactory aptitude:
- Zero obstacles: No colds, no seasonal allergies, and of course, no anosmia.
- Acuity: The panelist must be able to perceive nuances without physical bias.
2. Managing olfactory fatigue
The nose is a sensitive instrument that quickly becomes saturated. To prevent perceptions from becoming dulled, we impose strict limits:
- The golden ratio: No more than 6 products per session. Beyond that, olfactory fatigue distorts judgment.
- Randomization: The order of presentation is systematically random to avoid contrast or primacy effects.
- Total anonymity: Each sample is identified by a random three-digit code to eliminate any bias related to packaging or brand.
3. The "reset" protocol
Between two products, it is crucial to return to a neutral state. We apply a rigorous sensory cleansing protocol:
- Skin cleansing: Wash your hands with neutral soap if the product has been applied to the skin.
- Olfactory neutralization: A break of about 5 minutes, accompanied by a simple but effective technique such as breathing in the neutral smell of your own sleeve to "reset" your nose.
4. A controlled environment
The test must take place in a sensory "void". The room must be perfectly neutral: no trace of coffee, air freshener or any extraneous odors that could interfere with the product being tested.
5. Spontaneity in the service of precision
Olfactory memory is extremely fleeting. That's why we ask panelists to note their impressions immediately. Thanks to a structured and clear questionnaire, we capture the precise perception at the exact moment it occurs, before it is altered by memory or reflection.
The final word
These methodological precautions may seem excessive to the uninitiated. In reality, they represent the boundary between a mere subjective impression and solid scientific data. At SYRES, we are convinced that this invisible rigor makes all the difference to the success of your projects.
