In a classical conditioning experiment, a dog hears a bell just before receiving food several times. Eventually, the dog begins to salivate when it hears the bell alone. What is the conditioned stimulus (CS) in this scenario?

• A. The dog's salivation
• B. The sight of the experimenter
• C. The food
• D. The sound of the bell

Answer: (D)

Verified step by step guidance

1. Identify the key components of classical conditioning: the unconditioned stimulus (US), the unconditioned response (UR), the conditioned stimulus (CS), and the conditioned response (CR).
2. Recognize that the unconditioned stimulus (US) naturally triggers a response without prior learning. In this case, the food is the US because it naturally causes the dog to salivate.
3. Understand that the unconditioned response (UR) is the natural reaction to the US. Here, the dog's salivation in response to food is the UR.
4. Determine the conditioned stimulus (CS), which is a previously neutral stimulus that, after being paired repeatedly with the US, begins to elicit a similar response. The bell sound is initially neutral but becomes the CS after association with the food.
5. Note that the conditioned response (CR) is the learned response to the CS alone. The dog's salivation in response to the bell alone is the CR.