“The tongue has specific zones for different tastes (sweet, sour, bitter, salty).”

The idea that specific areas of the tongue (Review) are solely responsible for detecting sweet, sour, bitter, or salty tastes is a widely circulated misconception, often depicted as a "tongue map." This enduring myth traces its roots back to early 20th-century research by German scientist D.P. Hanig in 1901. Hanig's work investigated the relative sensitivity of different parts of the tongue to various tastes, and he did find slight variations in how intensely tastes were perceived across the tongue. For instance, he noted a slightly higher sensitivity to sweet at the tip and bitter at the back. However, his findings were misinterpreted and exaggerated over time.

The misinterpretation was largely cemented in 1942 when Harvard psychologist Edwin Boring replotted Hanig's data. Boring's graph, intended to show relative sensitivities, was later misinterpreted by other scientists and textbook authors to imply that areas of lower sensitivity meant *no* sensation, effectively creating the rigid, segmented "tongue map" we're familiar with today. This simplified, yet inaccurate, diagram became a staple in educational materials for decades, despite its lack of scientific basis.

In reality, all taste buds across the entire tongue are capable of detecting all five basic tastes: sweet, sour, salty, bitter, and umami. While some areas might exhibit a slightly lower threshold or be marginally more sensitive to certain tastes, there are no exclusive zones where only one taste can be detected. This scientific understanding was further clarified by researcher Virginia Collings in 1974, who re-examined Hanig's work and confirmed that while minor variations in sensitivity exist, all tastes can be perceived wherever taste receptors are present, including on the soft palate and epiglottis. The persistence of the myth is likely due to its appealing simplicity and the fact it was widely taught in schools, making it a difficult idea to dislodge from popular belief.