Jonah eats lunch at the school cafeteria everyday at 1:00pm….

Jonah eats lunch at the school cafeteria everyday at 1:00pm. One day, after eating lunch as usual, he is asked to go to the cafeteria at 2:00pm to work on a special project for his history class. He finds that when he walks in the door he starts to feel hungry. Which of the following concepts explains Jonah’s reaction?