Answer:
a non-neutral or unconditioned stimulus
neutral stimulus
Step-by-step explanation:
Ivan Pavlov developed a theory known as Classical conditioning. it is when two stimuli are linked together to produce a new learned response.
Ivan conducted a research with dogs. he demonstrated how the presence of food (stimulus) would lead to the dog salivating. salivation is known as an unconditioned response. When he gave the dogs food, he rang a bell. after a period, ringing the bell led the dogs to salivate. the bell is a neutral stimulus.