How the sense of smell works
Odour molecules bind to receptors in the nose. Signals travel to the olfactory bulb and on to several brain regions involved in identifying and interpreting smells.
Olfaction is closely connected with systems involved in memory and emotion. This connection helps explain why a familiar scent can prompt a vivid personal association.
Why a scent can evoke memories
Experiences shape the associations people develop with particular smells. A fragrance connected with a location or an event may later bring that memory to mind.
These associations are not universal. Culture, personal history, context and individual sensitivities influence how a fragrance is perceived.
Why fragrance intensity matters
A high concentration does not automatically create a better experience. Excessive fragrance can be distracting or uncomfortable, especially in shared spaces.
Room size, airflow, placement and timing determine how strongly people encounter a fragrance. A system should be adjustable and evaluated in the actual setting.
What scent habituation means
With repeated or continuous exposure, people may notice an odour less. This is called olfactory adaptation or habituation, depending on the process involved.
Regular occupants may therefore judge a fragrance differently from visitors entering the space. Evaluate the system with that difference in mind; avoid increasing intensity simply because staff no longer notice it.