We have four different kinds of taste buds. Each can taste only one type of flavor. These basic flavors are sweet, sour, bitter and salty. Smell, texture and imagination make up the rest of the variety of flavors we experience. If you could feed a slice of raw potato to a blindfolded volunteer who also had a plugged nose, and said the potato was an apple, the volunteer would not say otherwise.
Taste buds on the tongue