Smell is closely related to the nervous system. Olfactory sensitivity depends on the functional state of millions of sensory nerve cells in the nose. These nerve cells transmit information to the olfactory center of the brain through the olfactory nerve, which enables us to perceive various smells. However, many nervous system diseases, such as Parkinson's disease and Alzheimer's disease, may affect the sensitivity and quality of the sense of smell.
In addition, the sense of smell can also be trained and improved. Professional olfactory training, through continuous practice to identify different smells, can enhance olfactory sensitivity and recognition ability. This is very helpful for some occupations that need higher olfactory sensitivity and accuracy, such as perfume modulators and winemakers.
2. The sense of smell is related to emotion and behavior.
Smell can affect our mood and behavior. For example, some smells can make us feel happy, relaxed or warm, while others can cause discomfort or disgust. This is because smell can stimulate the parts of the brain that control emotions and behaviors, such as the emotional center and the cerebral cortex.
Therefore, the smell is also of great significance to the marketing of products. Proper smell can make consumers more willing to buy a product or increase their satisfaction. For example, adding specific smells to restaurants and shops can help attract customers and improve their happiness and desire to buy.
3. The sense of smell is related to genes.
Everyone's olfactory sensitivity and preferences are different. This is related to the individual differences of human DNA, that is, the variation of individual genome.
For example, the gene MHC (major histocompatibility complex) in human smiling muscles is related to olfactory preference. Studies have shown that people who like a certain smell usually like a certain type of human smiling muscles. The phenomenon of "similar preferences" can be traced back to the evolutionary history of human beings, which makes it easier for people with similar smells to form stable social and emotional relationships.
4. The sense of smell is related to the environment
The sense of smell is also influenced by the surrounding environment. When we are in different environments, our sense of smell may produce different perceptions. For example, in cities, the air is often polluted by automobile exhaust and industrial emissions, which may reduce the sensitivity of smell. In contrast, a cleaner natural environment may be more conducive to the healthy development of the sense of smell.
In addition, different cultures have different receptivity to smells. Some smells may be considered beautiful and pleasant in some cultures, but they are considered unpleasant or unwelcome in others.