How do we taste things
There are distinct regions on the tongue where the main tastes are recognized.
The tongue is covered with small bumps, called taste buds that are grouped together in areas with different functions. These taste buds react to simple tastes and pass messages to the brain.
Taste buds on the tip of the tongue detect sweet tastes, and those at the back of the tongue detect bitter tastes, groups of the taste buds at the side of the tongue measure sour and salty tastes. The taste of any food is a combination of these four basic tastes.
These taste buds, or flavor receptors, transmit the different taste information as a message to the brain. It is the brain processes the information and tells us what food is actually in our mouths.