Instrumental Conditioning and Learning

Recap from Last Class

• Review key points discussed in the previous class to ensure comprehension.

Instrumental Conditioning

• Definition: A learning theory where behavior is shaped by its consequences.
• Key Components:
• Rewards: Introduced to increase desired behaviors.
• Punishment: Introduced to decrease unwanted behaviors.

Autoshaping / Sign Tracking

• Definition: Animals adjust behavior through trial-and-error to influence their environment.

Thorndike’s Law of Effect

• Core Idea: The likelihood of a response is dictated by its outcome.
• Satisfactory Outcomes: Strengthen the association between responses and stimuli (S-R association).
• Undesirable Outcomes: Weaken the association between responses and stimuli.

Shaping Behavior

• Definition: Process of reinforcing successive approximations to achieve a specific behavior (operant response).
• Steps:
• Use an effective reinforcer.
• Start with simple initial behaviors.
• Gradually reinforce closer approximations to the goal behavior.

Methods / Key Terms of Instrumental Conditioning

• Aversive: Something bad.
• Appetitive: Something good.
• Positive vs. Negative:
• Positive (adding something): Positive punishment (weakens behavior), Positive reinforcement (strengthens behavior).
• Negative (removing something): Negative reinforcement (strengthens behavior), Negative punishment (weakens behavior).

Belongingness in Reinforcement

• Concept: Certain responses are more likely to be learned if they are naturally associated with the reinforcer due to evolutionary history.
• Example: Actions like operating a latch fit better with rewards than irrelevant actions like yawning.

Factors Influencing Learning

• Reinforcer Quality: Quantity, quality, and timing of reinforcement post-behavior matter.
• Immediate reinforcement after desired behavior maximizes learning.

Graph Analysis: Quality and Quantity Impact on Responding

• Study Findings: Higher rewards lead to greater motivation and continued abstinence in environments like addiction treatment.
• Behavioral-Contrast Effects: Changes in reward magnitude can affect behavior perception.

The Response-Reinforcer Relation

• Timing: Essential for effective learning.
• Delays in reinforcement consequences can hinder association.
• Credit-Assignment Problem: Difficulty in linking specific responses to delayed reinforcement.

Experiment with Rats: Reinforcement Timing

• Rats in different conditions showed variations in learning effectiveness based on timing and signaling of reinforcement.

Secondary Reinforcer Training

• Approach: To overcome issues with delayed reinforcement, secondary cues (like clickers) signal a primary reinforcer.
• Practice Exercise: Trainer vs. learner activity to reinforce desired behaviors using a clicker.

Response-Reinforcer Contingency

• Definition: Describes the necessity and sufficiency of a response to achieve a specific reinforcement outcome.
• Some behaviors may appear to be reinforced due to misassociation (superstitious behavior).

Superstitious Behavior

• Behaviors mistakenly believed to be effective due to accidental reinforcement.
• Innate Pathways: Certain behaviors may inherently connect with food presentation, influencing what is perceived as reinforcement.

Final Thoughts

• Understanding the relationship between responses and reinforcers is essential for effective instrumental conditioning.