Pictures of chili peppers make dionne's mouth water when she browses cooking sites on the web. in pavlov's terms, pictures of chili peppers are stimuli for dionne since she had to learn their association with yummy dishes

unconditioned stimuli

Pavlov fed dogs and was looking at salivation in response to the food. At a certain point, whenever he entered the room, the dog would start to salivate even when he was not bringing them food. The exact same happened to Dionne when she saw the chili peppers even though it was just a picture and not the real thing.
This it is an unconditioned response to an unconditioned stimulus.