Question

the tongue has different areas for tasting different tastes, but we do not have to place each substance at that area to know the taste. Why?

Answer 1

The taste spreads with salaiva

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Answer 2

The Tongue Map: Tasteless Myth Debunked. The notion that the tongue is mapped into four areas—sweet, sour, salty and bitter—is wrong. There are five basic tastes identified so far, and the entire tongue can sense all of these tastes more or less equally. ... Only in recent years have taste receptors been identified