Why does a smell bring a memory flooding back?
A novelist dunked a cake in tea and a whole childhood came back. Scientists have found a route from nose to memory, but not every claim holds up.
โถ Start the storyA smell can bring a memory back because the nose has a short, direct line to the parts of the brain that handle emotion and memory. When you sniff something, the signals from the smell receptors go through the , where the input starts to interact with the parts of the brain responsible for smell identification, memory and emotion. The bulb sends information on to the , the orbitofrontal cortex and the , where it contributes to emotion, memory and learning. Because the olfactory signal ends in or near the amygdala, odours are strongly linked to memories and can evoke emotions.
The most famous example is from literature. In his novel In Search of Lost Time, Marcel Proust has his narrator eat a tea-soaked , a small cake, and a long-forgotten childhood memory of eating one with his aunt is restored to him. From that memory he recalls the childhood home he was in, and even the town itself. Proust was the first to coin the term , a memory that comes to mind when everyday cues evoke the past without any conscious effort. Research suggests that such experiences are especially strong and frequent in relation to the sense of smell.
Step 1: Receptors catch an odour
Step 2:
Receives and sorts the signals
Step 3:
Emotion centre: odours are strongly linked to memories
Step 4:
Contributes to memory and learning
Step 5: A memory returns
Often emotional, often from childhood
What do smell memories look like in studies? Most memories that pertain to odour come from the first decade of life, whereas verbal and visual memories usually come from the 10th to 30th years of life. Odour-evoked memories are more emotional, bring stronger feelings of being taken back in time, and have been thought of less often than memories evoked by other cues. That is why the smell of a grandparent's kitchen can feel like a time machine.
Odour cues
- Mostly from the first decade of life
- More emotional
- Stronger feeling of being taken back in time
- Thought of less often
Verbal and visual cues
- Usually from the 10th to 30th years of life
- Less emotional than odour-evoked memories
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Recap
The route from nose to memory is real, but the strongest claims, such as aromatherapy cures, rest on thin evidence.
๐ก A trick to remember it ยท Smell is a door with no lock on the way to feelings: it opens straight into the rooms of emotion and memory.
Surprising fact ยท Memories evoked by odours tend to be more emotional and more often from the first decade of life than memories evoked by words or pictures.
Sources (4)
No source, no claim. Every fact in this lesson (15 claims) cites at least one of these.