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RE: Myth or Fact #2 Tongue is mapped into different areas of taste
This is a myth, all the tongue surface can detect all the flavours with the same sinsitivity. Furthermore, there is a 5th basic flavour called umami, the major ingredient that has this flavour is glutamate.
https://www.livescience.com/7113-tongue-map-tasteless-myth-debunked.html