In 32 of 33 cases, people turned the same way
Em meio às restrições da pandemia, pesquisadores espanhóis e japoneses tropeçaram em algo que os seres humanos carregam no corpo sem jamais ter percebido: uma preferência universal por girar no sentido anti-horário ao caminhar. Independente de cultura, gênero ou lateralidade, 32 dos 33 indivíduos observados seguiram o mesmo padrão silencioso. A descoberta sugere que há uma assimetria inscrita na biologia humana — uma regra invisível que pode ter moldado, sem que soubéssemos, desde pistas de corrida até a arquitetura dos espaços que habitamos.
- O que começou como uma análise de distanciamento social durante a COVID-19 revelou um comportamento humano que ninguém havia sistematicamente documentado antes.
- A consistência do padrão — 32 de 33 casos — foi perturbadora o suficiente para transformar uma observação acidental em um programa de pesquisa internacional entre Espanha e Japão.
- Pesquisadores testaram e descartaram explicações culturais, de lateralidade, de dominância ocular e até forças geofísicas como o campo magnético terrestre e o efeito Coriolis.
- A única variável com correlação significativa foi a idade: crianças demonstram a preferência anti-horária com ainda mais intensidade do que adultos, apontando para uma origem biomecânica profunda.
- Arquitetos, engenheiros e urbanistas agora se veem diante da possibilidade de que espaços públicos, corredores e fluxos de pedestres precisem ser repensados à luz de uma assimetria que sempre esteve ali.
Durante os primeiros meses da pandemia, pesquisadores da Universidade de Navarra revisavam horas de imagens de pedestres em ruas e praças espanholas, tentando entender como as pessoas mantinham distância umas das outras. O que encontraram foi outra coisa: em 32 dos 33 casos analisados, quando as pessoas giravam enquanto caminhavam, elas giravam no sentido anti-horário.
A consistência do padrão era difícil de ignorar. Claudio Feliciani, professor associado da Universidade de Tóquio, integrou a equipe que transformou essa observação acidental em pesquisa sistemática. Junto com os colegas espanhóis, ele conduziu experimentos em espaços abertos e fechados, testando se a preferência variava conforme a cultura, o gênero, a lateralidade ou o tamanho dos grupos. Chegaram a cobrir um dos olhos dos participantes para verificar se a dominância ocular explicava o fenômeno. A tendência anti-horária persistiu.
O que os dados revelaram foi ao mesmo tempo simples e intrigante: apenas a idade mostrou correlação significativa. Crianças apresentaram a preferência com ainda mais intensidade do que adultos. Todos os demais fatores — origem cultural, lateralidade, contexto social — não fizeram diferença relevante. Isso aponta para uma assimetria biomecânica inerente ao corpo humano, algo que a maioria dos outros animais aparentemente não compartilha.
O mecanismo exato ainda é desconhecido, e novos experimentos estão planejados para investigá-lo em nível individual. Mas as implicações já se fazem sentir: se os seres humanos têm uma tendência inata a girar em uma direção, arquitetos e engenheiros talvez precisem repensar o desenho de corredores, escadarias e fluxos em centros comerciais e terminais de transporte. Feliciani aponta uma coincidência reveladora: pistas de corrida e automobilismo são quase universalmente projetadas no sentido anti-horário — uma convenção que pode ter nascido, sem que ninguém soubesse nomear, da mesma regra silenciosa escrita em nossos corpos.
During the early months of the pandemic, when Spanish health authorities were scrambling to design social distancing guidelines for public spaces, researchers at the University of Navarra found themselves reviewing hours of video footage of pedestrians moving through streets and plazas. They were looking for patterns in how people naturally maintained distance from one another. What they stumbled upon instead was something far stranger: in 32 out of 33 test cases, when people turned while walking, they turned counterclockwise.
The discovery seemed too consistent to be random. Claudio Feliciani, an associate professor at the University of Tokyo, was part of the team that would eventually expand this initial observation into a full research program. "My colleagues noticed, quite by accident, that as people moved and rotated, they preferred to turn counterclockwise," he explained. The finding was unexpected enough that it prompted the researchers to ask a fundamental question: Was this preference universal, or did it depend on where people lived, how old they were, or some other factor?
To test this, Feliciani's team in Japan joined forces with the Spanish researchers and began conducting experiments in both open and enclosed spaces, watching pedestrians under varying conditions. They measured whether culture mattered. They looked at group size, gender, handedness, and age. They were thorough in their skepticism, testing whether the preference might stem from something obvious—like the dominance of one eye over the other. When they covered people's left or right eyes, the counterclockwise tendency persisted. They considered whether Earth's magnetic field or the Coriolis force might be at work. Both seemed unlikely.
What emerged from the data was striking in its simplicity: age was the only variable that showed a meaningful correlation. Children demonstrated an even stronger preference for counterclockwise turns than adults did. Everything else—the cultural background of the person, whether they were left-handed or right-handed, whether they were walking alone or in a group—made no significant difference. This suggested something biomechanical was at play, some asymmetry built into the human body itself that most other animals do not appear to share.
Yet the exact mechanism remains a mystery. Feliciani and his colleagues have plans to conduct new experiments, this time focusing on individuals rather than groups, hoping to isolate the source of the behavior at a deeper biological level. The implications, however, are already becoming clear. Architects and engineers design spaces based on assumptions about how people move through them. If humans have an innate tendency to turn one direction, that knowledge could reshape everything from the layout of corridors and staircases to the flow of foot traffic in shopping centers and transit hubs. Feliciani has noted an intriguing parallel: in certain sports—running competitions and motorsports among them—tracks are almost universally designed to run counterclockwise, a convention that may have emerged from observing this same human preference. The question now is whether that convention was always aligned with our nature, or whether we have simply been following an invisible rule written into our bodies all along.
Notable Quotes
My colleagues noticed, quite by accident, that as people moved and rotated, they preferred to turn counterclockwise.— Claudio Feliciani, associate professor at the University of Tokyo
The strong tendency in humans suggests an asymmetry at the biomechanical level, something that is not common in other animals.— Claudio Feliciani
The Hearth Conversation Another angle on the story
Why did it take a pandemic for someone to notice this? Surely people have been turning in circles for thousands of years.
True, but you need the right moment and the right question. The Spanish researchers weren't looking for this—they were trying to solve a practical problem about social distancing. They had video footage and time to study it carefully. That combination is rare.
So it's not that the behavior is new. It's that we finally looked closely enough to see it.
Exactly. And once you see it, you can't unsee it. Thirty-two out of thirty-three people. That's not noise. That's a signal.
But we don't know why yet. That seems like the real story—that we've found this universal pattern and have no idea what's causing it.
Right. We've ruled out the obvious suspects. It's not about which eye you favor, or where you're from, or whether you're male or female. It's something deeper, something in how our bodies are built. That's both fascinating and humbling.
And if architects start designing around this, does that mean we've been fighting our own nature this whole time?
Possibly. Or we've just been lucky—like those sports tracks that were already counterclockwise. We might have been following the pattern without knowing why.