4.10

Reinforcement Dynamics

  • Reinforcement is dynamic and changes in potency based on conditions.

Motivating Operations

  • Motivating Operations: Factors that influence the effectiveness of a reinforcer.

  • Deprivation: An establishing operation that increases reinforcer potency.

    • Example: Lack of food leads to food becoming a stronger reinforcer.

  • Satiation: An abolishing operation that decreases the potency of a reinforcer.

    • Example: Having just eaten a large meal makes food less reinforcing.

Habituation to Reinforcers

  • Habituation is the process by which responses to a stimulus decrease after repeated exposure.

    • Distinct from satiation; both affect reinforcement but through different mechanisms.

  • Study by Fran McSweeney: Pioneered research on within-session changes in reinforcement.

    • Experiment with Rats:

      • Rats pressed a lever for food.

      • Response rate decreased over time, indicating food lost reinforcing properties due to satiation.

Response Strength Over Time

  • Baseline Conditions:

    • Response strength decreases with more food consumed, indicating satiation effects.

  • Environmental Changes:

    • Removing the lever temporarily disrupted behavior leading to an increase in response when it returned.

    • Suggests a process of dishabituation, where removing the stimulus temporarily restores its reinforcing effect.

Interaction of Satiation and Dishabituation

  • Satiation decreases response strength as the subject becomes less deprived.

  • Dishabituation can occur by changing stimuli; the subject momentarily responds more even when sated.

    • Example: After a big meal, the introduction of dessert can trigger a renewed desire to eat.

Example Study on Salivation

  • Study by Epstein: Observed salivation changes in response to food stimuli (cheeseburgers and pie).

    • Salivation decreased over trials but increased when a new food (pie) was presented, demonstrating habituation.

  • Operant Responses:

    • Rate of pressing the lever decreased over time; responding increased when the new stimulus was introduced.

Conclusion on Reinforcement Dynamics

  • Both satiation and habituation are important in understanding how stimuli become reinforcement.

  • Habituation is a type of motivating operation, influencing the potency of reinforcers.

  • Recognizing these dynamics is key to effectively utilizing reinforcement in behavioral contexts.