What is the unconditioned stimulus in this case? the squeaking mouse occurring reaction in an organism consider what automatically elicits barking in Duke. So, she decides to squeak the mouse and knock on the door at the same time to condition Duke to bark. She already knows that squeaking a mouse toy will make Duke bark. Something that reliably produces a naturally occurring reaction to an organism - dogs are presented with food and they began to salivate Rachel is training her dog, Duke, to bark when there is a knock on the door.
