Which statement about taste on the human tongue is actually correct?
- All areas of the tongue can detect all five basic tastes
- Sweetness is only detected at the tip of the tongue
- Bitterness is only detected at the back of the tongue
- Saltiness is only detected along the sides of the tongue
Why A? And why not the others?
Correct answer: A. All areas of the tongue can detect all five basic tastes
Taste buds scattered across every region of the tongue, and even on the soft palate and throat, are each capable of sensing all five basic tastes: sweet, sour, salty, bitter, and umami; sensitivity varies only slightly by region, not by exclusive zones. The famous diagram assigning sweetness only to the tip descends from a 1901 German study of taste thresholds that was mistranslated and then popularized as a strict map; a 1974 replication at the University of Pittsburgh tested each taste at every tongue region and found no such exclusive zones. The bitterness-at-the-back claim and the saltiness-at-the-sides claim come from that same discredited map, and neither survives a simple test: dab lemon juice onto the supposedly sweet-only tip and it still tastes sour.
Source: Encyclopaedia Britannica: Debunking the Tongue Map; Smithsonian Magazine: The Taste Map of the Tongue You Learned in School Is All Wrong