Final answer:
In the given example of classical conditioning, the conditioned stimulus (CS) is the sight of a red light, which was initially a neutral stimulus (NS), but became associated with the act of stopping the car, initially triggered by the brakes engaging (UCS).
Step-by-step explanation:
Classical Conditioning in a Real-World Scenario
One original example of classical conditioning involves the case where a red light (CS) becomes associated with the brakes of a car engaging (UCS) to cause a driver to stop (UCR). Over time, the sight of the red light (NS) alone will cause drivers to press the brakes (CR), even before they consciously process the action. After pairing the two stimuli, the red light effectively becomes a conditioned stimulus (CS).
Breaking down the example, we have the following associations:
Neutral Stimulus (NS): Red light before conditioning
Conditioned Response (CR): Pressing the brakes in response to the red light alone
In the provided options, a) Ringing a bell, b) Seeing a red light, c) Hearing a specific song, and d) Smelling a certain fragrance, the correct answer for the conditioned stimulus (CS) in this scenario is b) Seeing a red light.