What are the functions of flavor enhancer?

Enhancing the flavor of foods is an art that is critical to the acceptability of foods, and a restaurant can succeed or fail depending on how that art is practiced.

Flavour enhancers intensify flavors already present, especially when the desirable flavors are relatively weak. Enhancers themselves contribute little flavor to a food.

Salt’s best known function is to enhance the flavor of foods. People like salt because human bodies need sodium chloride. Breads are less bland; cheeses are not as bitter and processed meats are more flavorful in part because of the addition of salt.

Other best-known and most popular flavor enhancer is Monosodium glutamate (MSG). Flavor enhancers intensify mostly attributes of mouth feel such as dryness and astringency.

Flavor enhancers increase the sensitivity of the taste buds thus increasing flavor. It is also suggest that an increase in salivation as a result of the flavor enhancers will increase flavor perception.
What are the functions of flavor enhancer?