Olfactory system and vomeronasal organ: Differences and connections between two pheromone-sensing channels
Human smell is far more complex than we imagine. It’s not just about “smelling fragrances,” but an ancient form of communication—a language at the chemical level.
From the most primitive “identifying food and danger” to the more subtle “perceiving others’ emotions and attractiveness,” our brains have long been accustomed to communicating with the world through smell.
In this unseen symphony of chemistry, two “performers” work silently together: the primary olfactory system and the secondary olfactory system (vomeronasal organ, VNO).
One interprets the scents permeating the air, while the other captures the “hidden signals” subtly transmitted between individuals.
I’ve always been fascinated by the coordination of these two pathways. After all, when we talk about “pheromone perfume” or “pheromone fragrance,” we’re actually exploring an ancient dialogue that spans evolutionary history: how much of the “animal age” language does our body still use?
I. Structural and functional differences between the two sensing channels
When we “smell an odor,” it’s actually the main olfactory epithelium at work—it’s hidden deep in the nasal cavity and can recognize floral scents, coffee aromas, and even the smell of burnt food in the air.
The vomeronasal organ (VNO), however, exists on another level—a system known as the “instinctive decoder.” It’s buried even deeper, not designed for odors, but rather for **pheromones**.
If the primary olfactory system helps us understand “the smell of the world,” then the vomeronasal organ is more like interpreting “the intentions of our kind.”
| system | Perceived Object | Central connection | Mode of action |
| Main sense of smell | Environmental odors, volatile molecules | Main olfactory bulb → olfactory cortex | It produces a perceptible olfactory experience, which is associated with memory and emotion. |
| Plow nose | Pheromones, low-volatility signals | Paraolfactory bulb → Hypothalamus, amygdala | It produces no odor and directly regulates hormones and social behavior. |
In short: the sense of smell is connected to consciousness, and the vomeronasal organ is directly connected to instinct.
II. Why do pheromone perfumes “act on the subconscious”?
This is precisely what makes pheromone perfumes both alluring and questionable. Scientists question their “real effects,” yet they continue to sell like hotcakes. Why?
First, we must acknowledge a reality: in humans, the vomeronasal organ has degenerated, and its connection to the brain has almost disappeared. In other words, we may no longer rely on it to “smell” pheromones.
But—the story doesn’t end there.
The olfactory system takes over: Research shows that some receptors in the human primary olfactory system can still recognize molecules similar to pheromones (such as androstenone, which is commonly found in pheromone perfumes).
Bypassing the VNO pathway: Even with the degeneration of the vomeronasal organ, these molecules can still activate brain regions associated with emotions and social interaction—particularly the amygdala and hypothalamus. However, this response is more subtle, not directly “triggering behavior” like in animals, but rather “evoking emotions.”
Therefore, when brands claim that pheromone perfumes can influence the “subconscious,” it’s not entirely unfounded.
It’s just that the influence is more like a chemical atmosphere—making your interactions with those around you smoother and more natural, rather than “manipulating” others.
In my opinion, the allure of pheromone perfumes lies not in their ability to “change others,” but in their subtle ability to change oneself. That sense of relaxation and confidence is often the real plus.
III. A Rational Perspective: Scientific Boundaries and the Use of Wisdom
Understanding the division of labor between the sense of smell and the vomeronasal organ also serves as a reminder to consume rationally and not be misled by “mysterious effects.”
limitation:
Non-scent experience: Pheromone itself is odorless. If a pheromone perfume is too strong, the “scent experience” of the primary sense of smell will actually mask its subconscious effects.
Individual differences: The effects vary from person to person. Olfactory sensitivity, genetics, and even cultural background can all affect perception.
Advantages:
Emotional Anchoring: Use pheromone perfume as an emotional aid. Wearing it during interviews, social events, dates, etc., can help you enter a “confidence mode.”
Chemical lubricants: They don’t forcefully change anyone’s feelings but rather make the atmosphere more gentle and natural in a subtle, almost imperceptible way.
Conclusion: Smell is the language of the world.
The role of pheromones in humans is no longer the “instant recognition” signal found in the animal kingdom.
It’s more like a subtle, subconscious dialogue—the primary olfactory system perceives the world, while pheromone molecules work behind the scenes, gently plucking the strings of our innate social interactions.
Therefore, instead of debating whether pheromone perfumes are truly effective, it’s better to view it as an experiment combining science and emotion.
After all, true attraction is never about chemical formulas but about the aura you exude at that moment.
Want to experience this “invisible chemical language”?
Click here to explore our curated selection of pheromone fragrances —
making scent more than just an aroma, a silent dialogue between you and the world.
