How scents affect the brain: The effects of smell on memory, emotions, and well-being
How do scents affect the brain?
Scents influence the brain through the olfactory system, which is directly connected to the limbic system—the part of the brain responsible for emotions, memory, and behavior. As a result, scents can evoke memories, alter mood, and affect cognitive processes.
For people, smells have the power to evoke memories. The sense of smell activates areas of the brain associated with emotion, memory, and learning. Today, neuroscience is exploring the possibility of using the information provided by smells to enhance neuroplasticity.
How do scents work in the brain?
There is growing evidence that sensory stimulation improves cognitive abilities such as language, attention, memory, orientation, and motivation. A study by the University of California found that certain smells can significantly enhance these abilities.
This happens because olfactory receptor cells send their signals, via the olfactory nerve, directly to the brain, primarily to the amygdala, hippocampus, and hypothalamus.
These areas, also known as the limbic system, are directly responsible for emotions, memories, and decision-making. Studies show that olfactory stimulation can help enhance neuroplasticity—that is, the brain’s ability to reorganize itself, recover, and adapt to new situations.
We can say that scents can influence emotional states, promote concentration, or even improve memory. The neuroscience of smell thus opens new avenues for the study of complementary therapies for neurodegenerative diseases.
Scents and Emotional Well-being
Certain scents have a positive impact on our emotions. Thanks to the direct connection between the olfactory system and the brain’s limbic system—where memories are stored—a particular scent can trigger a veritable emotional rollercoaster. A specific aroma, when linked to a pleasant memory, can reduce stress and anxiety and improve mood. Have you ever wondered why the smell of freshly baked bread fills us with nostalgia?
Scents weave a rich emotional tapestry that we can tailor to strengthen connections with positive emotions, rekindle pleasant memories, or evoke feelings such as love, joy, or calm. Certain scents influence behavior, even affecting the decisions we make based on the emotions, memories, or sensations they trigger. A scent that reminds us of a loved one predisposes us to accept a proposal, while a scent we associate with an unpleasant situation pushes us toward rejection.
Our emotional response to a smell depends less on the type of scent itself and more on the information our brain has stored and the emotions and memories that have been imprinted there.
Aromatherapy: Natural Scents for Well-Being
Our olfactory memory varies greatly from person to person; a professional perfumer, or “nose,” can have more than 3,000 scents stored in their memory. Most of us typically have a few hundred… which is no small number.
Many of the scents etched in our memory are linked to nature, which is why the brain reacts positively to most scents associated with the plant world: flowers, fruits, and wood. Aquatic scents, such as the smell of seawater or rain on the earth, are also typically associated with positive emotions and sensations.
What happens is that when we perceive certain scents that the brain identifies as pleasant and positive, neurotransmitters such as dopamine, serotonin, and endorphins are released, promoting feelings of well-being, relaxation, energy, and so on.
The neuroscience of smell is advancing rapidly as we gain a better understanding of how the human brain works; something as ethereal and invisible as a scent can also serve as a form of therapy whose benefits extend beyond mere pleasure.