Man is a very complicated animal. The visual and olfactory stimulation of food can make people salivate. The stimulation of fragrance is particularly acute. Some experts have studied that although the human nose is not as sensitive as some animals' smell, the brain's response and smell processing are incomparable. When human beings smell something, the odor receiving part will open a short and unobstructed road to the limbic system of the brain, which is just the area that controls emotion, memory and happiness. Then, within a few microseconds of smelling the smell, the intuitive response erupted.

Research shows that when the eyes and nose touch the things they like at the same time, there is a part of the brain called the "right medial frontal orbitofrontal cortex", which can produce the cognition of feeling happy or lovely. To put it simply, when an irresistible fragrance is paired with attractive visual images, we are more likely to have this experience deeply imprinted in our minds in addition to feeling happy. Although the smell is invisible and intangible, it affects people's mood and arouses people's mood in all aspects of human life. For example, the smell of popcorn in the cinema, perfume in the cosmetics counter on the first floor of the mall, coffee in the coffee shop, bread in the bakery, etc. These tastes have formed a fixed scene cognition in people's minds, attracting consumers' attention, memory, recognition, and consumption.