The tongue "taste map" is a myth — every region tastes everything

Generations of schoolchildren learned that the tongue is divided into zones — sweet at the tip, salty and sour along the sides, bitter at the back. It is wrong. All regions of the tongue that detect taste respond to all five basic tastes: sweet, sour, salty, bitter and umami.

The myth traces to a 1901 German study by David Hänig, who measured slight differences in sensitivity across the tongue — a real but minor effect. In the 1940s, psychologist Edwin Boring redrew Hänig’s data into a simplified graph that made it look as if each region detected only one taste. The misleading “map” then spread into textbooks worldwide.

Later experiments, including work in 1974, confirmed the regional differences were small and insignificant, and that taste buds everywhere carry receptors for every basic taste.

What you experience as flavour is built in the brain’s gustatory cortex, which blends these taste signals with smell, texture and temperature into a single perception.