Where is acidity perceived on the tongue?

• A. Tip of the tongue
• B. Sides and top
• C. Back of the tongue
• D. Center of the tongue

Answer: (B)

Acidity, or sour taste, is detected by receptors that are most concentrated along the sides of the tongue, where acidic compounds stimulate taste cells effectively. The top (front-to-mid) portion of the tongue also contributes to sensing sour because taste buds are distributed across the tongue’s surface, not isolated to one tiny spot. So acidity isn’t limited to a single area; it’s best described as being perceived on the sides and the top.

Historically, people learned that different tastes map to specific tongue regions, but modern understanding shows taste receptors are spread across the surface, with certain areas slightly more sensitive to particular flavors. The back of the tongue is more closely associated with bitterness, the tip with sweetness, and the sides and portions of the top with sourness, which is why “sides and top” is the best description.