Brazilian neuroscientist and aromatherapist Daiana Petry says the scent of a father is one of the most resistant memories the human brain holds, capable of transporting a person back to moments experienced decades earlier. She made the comments around Father's Day, marked in Brazil on Sunday, August 9.
Petry said the bond between scent and memory is not only sentimental but biological. Smell, she explained, is the only sense with a direct connection to the areas of the brain responsible for emotions and affective memories.
How smell reaches the brain differently
Unlike images and sounds, which pass through several stages of processing, Petry said aromas take a shortcut straight to the limbic system. That region houses the amygdala, which focuses on emotions, and the hippocampus, which is central to forming memories.
As a result, smelling a father's scent does not just recall the fragrance itself, according to Petry, but the entire emotional context tied to it, whether that is the joy of a reunion, the comfort of advice once given, or longing for a father who has died. The brain registers the sense of safety, warmth and belonging associated with that presence, she said.
Why the memory forms so early
Petry said the reason these memories are so difficult to erase lies in when they are formed. Olfactory memory is built during childhood, a period of high brain plasticity, when the brain is highly receptive to registering the sounds, voices and especially the scents of the people who represent a child's first emotional bonds.
A father's scent becomes a kind of emotional signature, she said. Even if an adult cannot describe that exact scent in words, the mind recognizes it instantly when encountering something similar, reactivating the same neural connections of protection and love that were created in childhood.
A reference point for identity
Petry said these lasting memories go beyond nostalgia and play a key role in shaping a person's emotional identity. Affective memories linked to smell, she said, act as reference points for attachment that help tell the story of who a person is. For neuroscience, she added, rediscovering a father's scent is a way of reconnecting with essential parts of one's own life story.
Petry said affective memories help tell people who they are, and that the scents that marked childhood remain recorded as references of attachment, protection and love. Rediscovering them, she said, is a way of finding important parts of one's own history again.
