When Julie's father comes home from work he opens the front door and picks her up to give her a big hug. Before long, Julie starts smiling whenever she hears her father turn his key to open the door. In this situation, Julie's smiling at the sound of her father's key turning in the door is an) _____; the hugging is an) _____.
A) unconditioned stimulus; conditioned response
B) unconditioned response; conditioned stimulus
C) conditioned stimulus; unconditional response
D) conditioned response; unconditional stimulus

Question

Quizplus · Accepted Answer

Julie's smiling at the sound of her father's key turning in the door is a conditioned response because it is a learned reaction to a previously neutral stimulus (the sound of the key). The hugging, which naturally elicits a smile from Julie without prior learning, is an unconditioned stimulus.

When Julie's Father Comes Home from Work He Opens the Front