【正确答案】When an animal is presented with food, it will salivate. If a bell is repeatedly presented shortly before the food is administered, the animal will begin to salivate soon after the sound of the bell, even if the food is not offered. With repeated trials of the bell followed by the food, the latency of the response decreases. This process is called conditioning, and salivation to the sound of the bell is termed the conditioned response. The conditioned response may be unlearned or extinguished if the bell is presented a number of times without being followed by food.