a) What is the difference between unconditioned and conditioned stimulus?
b) Consider the below scenario and identify the corresponding US, UR, CS, CR: "Andre, after an evaluation at his university, went for pizza with his friends. They decided to go to one of the best restaurants in town, called 'Proper Pizza'. Andre ate a pizza with arugula. After eating, nearly 30 minutes later, he became sick. His friends took him to the hospital. Andre had food poisoning. Since then, Andre never ate pizza again. Furthermore, everything that reminds him of pizza, he starts to feel sick or have some symptoms of nausea.