You are walking along and are suddenly startled by the loud sound of a truck backfiring. Your startle response is the __________, and the sound of the backfire is the __________.
A)UR; US
B)CS; US
C)CR; CS
D)CR; UR

Question

Quizplus · Accepted Answer

The startle response is the unconditioned response (UR) since it is an automatic and involuntary reaction that occurs without any prior learning. The sound of the backfire is the unconditioned stimulus (US) since it naturally and automatically triggers the startle response.

You Are Walking Along and Are Suddenly Startled by the Loud