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To Swedes, the scent of surströmming (鲱鱼罐头) is pleasant, but to most others, it’s sickening. This contrast highlights the role of culture in shaping our perceptions (见解) of scent. However, researchers now suggest that biology might play a more significant role than previously thought.

Artin Arshamian, a neuroscientist at the Karolinska Institute in Sweden, and Asifa Majid, a psychologist at the University of Oxford, noticed from their own previous work that people from different cultures described smells differently. They also knew from past experiments by other researchers that culture was important in determining which sorts of faces people found beautiful. Thus, they expected to see a similar phenomenon with smells.

The researchers conducted a study involving nine diverse groups of people, including hunter-gatherers in Mexico, farmers in Ecuador, and residents of cities like Mexico City and Bangkok. They were presented with ten smells, ranging from isovaleric acid to vanilla extract, and asked to rate them according to pleasantness. The results showed high consistency across cultures, with isovaleric acid universally disliked and vanilla extract mostly enjoyed.

Interestingly, the chemical composition of the smells accounted for 41% of the reactions, while cultural factors only explained 6%. It is quite different in the case of visual perception of faces, where a person’s culture makes up 50% of the explanation for which faces they find beautiful. Meanwhile, the researchers identified an “eye of the beholder” effect in our perceptions of scent. This phenomenon, though less obvious than in visual perception, represents the personal preferences that are shaped by influences outside individual culture, accounting for 54% of the differences in which smells people liked.

This study suggests that our sense of smell may be more influenced by biological factors than cultural ones. It challenges the idea that culture alone determines what we find pleasant or unpleasant and opens up new ways of exploring the biological basis of our senses.