What are external cues/signals and how does it affect hunger?

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Explanation: When consuming a food for the first time, the level of dopamine transmission in the brain is increased and causes a feeling of enjoyment. When exposed to the food more often, the dopamine response transfers onto cues that are associated with food reward, for example the sight or smell of the particular food.

replace   c   with   a   and simplify.

a = c , b = a, q = n , 2 , a = c , 900 b= a , 700 , q = n , 600 , 2 = b o t h , b = a , q = n