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.