Shelly has developed a fear of bridges due to the recent, graphic news coverage of people falling from a collapsed bridge. Which of the following is the CS?
A) bridges
B) graphic news coverage
C) people falling
D) collapsed bridges
Answer: A
Rationale: A conditioned stimulus (CS) is a once neutral stimulus that elicits a conditioned response (CR) because it has a history of being paired with an unconditioned stimulus (US). In this example, bridges used to be neutral, but now elicit fear. In contrast, graphic news coverage, people falling, and collapsed bridges were never neutral stimuli.
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