Do All Humans Speak One Emotional Language?

The chapter's central question

Darwin sought to support a common ancestor of mankind by finding common patterns in the expressions of distant groups, children, and the blind. This was a powerful argument against the idea that different races had fundamentally different humanity. Expressing emotions has an evolutionary history that predates language.

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Darwin planned an ingenious global project to prove his hypothesis. A questionnaire containing 16 questions was sent to missionaries, explorers, and colonial officials in remote areas around the world.

'Do native Australians also open their mouths and widen their eyes when they are surprised? Do Amazon tribesmen also shed tears and lower their mouths when they are sad? When you're angry, do you clench your fists and grit your teeth?'

Although the answers did not all match perfectly, Darwin discovered commonalities in many expressions that were repeated in distant populations. He read this as evidence that emotional expression did not arise solely from cultural practices, but also had aspects inherited from our common ancestors. In addition to these universal trends, today's research also looks at the impact of culture and context on how expressions are revealed and interpreted.

Context and nuance

Darwin's 『Expression of Emotions in Man and Animals』 studied facial expressions and gestures not as created fixed symbols but as behaviors formed throughout the history of the species. Comparing babies, animals, photographs, works of art, and reports from different parts of the world, he argued for the continuity between humans and other animals.

Not all of his survey responses matched perfectly, and today's study also discusses the influence of context and culture, as well as generality. Although the tendency to widen one's eyes is common, when that expression is revealed and how it is interpreted can vary. Our common humanity and cultural diversity are not either/or.

Do not oversimplify it this way

Knowing our evolutionary origins does not always make our current emotions useful or commands to follow. Reactions formed in past environments may be at odds with today's situations, and cultural learning and individual differences play a large role on universal trends. Darwin's historical data and the conclusions of today's emotional science must be read separately.

Philosophy in life

Have you ever felt so pitiful that the mere sound of a rustle in a dark alley made your hair stand on end and your heart pound like it would explode?

Facial expression feedback loop: Instead of forcing a smile when you feel sad or droopy, relieve body stiffness with a light temporomandibular joint massage and shoulder stretching.

Primary-source guide

Primary guide: The Expression of the Emotions in Man and Animals, especially chapters 1–3 and 8–14.

Pathos Editorial · Reviewed 2026-09-12