According to Robert Rescorla's contingency model of classical conditioning, which of the following best describes the relationship necessary for effective conditioning to occur?

• A. The number of pairings between the conditioned and unconditioned stimuli is the only factor that determines learning.
• B. The conditioned stimulus must reliably predict the unconditioned stimulus for learning to take place.
• C. The strength of the unconditioned stimulus alone determines the strength of the conditioned response.
• D. The conditioned stimulus and unconditioned stimulus must always be presented simultaneously.

Answer: (B)

Verified step by step guidance

1. Understand that Robert Rescorla's contingency model emphasizes the importance of the predictive relationship between the conditioned stimulus (CS) and the unconditioned stimulus (US) in classical conditioning.
2. Recognize that according to this model, effective conditioning occurs not merely because the CS and US are paired repeatedly, but because the CS reliably signals the occurrence of the US.
3. Note that this means the CS must provide information about the likelihood of the US happening, creating a contingency where the presence of the CS predicts the US.
4. Contrast this with other views that focus solely on the number of pairings or the strength of the US, which Rescorla's model argues are insufficient alone for learning.
5. Conclude that the key relationship necessary for effective conditioning is that the conditioned stimulus must reliably predict the unconditioned stimulus, enabling the organism to learn the association.