Chapter 5: Learning. Learning Outcomes Define learning. Describe principles and methods of classical conditioning.

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Presentation transcript:

Chapter 5: Learning

Learning Outcomes Define learning. Describe principles and methods of classical conditioning.

Learning Outcomes Describe principles and methods of operant conditioning. Discuss cognitive factors in learning.

Learning, Experience, and Change

What is Learning? Behaviorist Perspective – A relatively permanent change in behavior that arises from practice or experience Cognitive Perspective – A mental process that may or may not be associated with changes in behavior

Classical Conditioning: Learning What is Linked to What

Classical Conditioning Simple form of associative learning that enables organisms to anticipate events – Reflexes (unlearned) are evoked by certain stimuli – Reflexes can also be learned by association

Contribution of Ivan Pavlov While studying salivation in dogs, Pavlov “happened” upon the principles of conditioning Reflexes (unlearned) can be learned (or conditioned) through association

Why Did Pavlov’s Dogs Salivate? Behaviorist perspective – Dog learned to salivate in response to the tone because the tone had been paired with the meat powder Cognitive perspective – The dog salivated in response to the tone because the tone became mentally connected with the meat

Stimulus and Response in Classical Conditioning Unconditioned stimulus (UCS) Unconditioned response (UCR) Orienting response Conditioned stimulus (CS) Conditioned response (CR)

A Schematic Representation of Classical Conditioning

Truth or Fiction? A single nauseating meal can give rise to a taste aversion that lasts for years.

Truth or Fiction? A single nauseating meal can give rise to a taste aversion that lasts for years. TRUE!

Taste Aversion Example of classical conditioning Adaptive; motivate organism to avoid harmful foods Only one association may be required; time between unconditioned and conditioned stimulus can occur hours apart

Evolution of Taste Aversion Animals that acquire taste aversion quickly – more likely to survive – Garcia and Koelling (1966)

Extinction and Spontaneous Recovery Extinction – CS no longer followed by an UCS - no longer elicits CR Spontaneous Recovery – CS once again elicits CR – A function of time that has elapsed since extinction occurred

Learning and Extinction Curves

Generalization and Discrimination Generalization – Tendency for CR to be evoked by stimuli similar to the stimulus to which the response was conditioned Discrimination – CR evoked by limited range of stimuli due to pairing only the limited stimulus with the US

Higher-Order Conditioning Previously neutral stimulus becomes a conditioned stimulus after being repeatedly paired with a stimulus that has already become a conditioned stimulus – Condition dog to salivate to tone – Repeatedly pair light with tone – Light evokes salivation

Classical Conditioning of Emotional Responses “Little Albert” - conditioning for fear – Conditioned to fear a rat which generalized – Biological preparedness – in this case fear of an animal

Truth or Fiction? Psychologists helped a young boy overcome his fear of rabbits by having him eat cookies while a rabbit was brought closer and closer.

Truth or Fiction? Psychologists helped a young boy overcome his fear of rabbits by having him eat cookies while a rabbit was brought closer and closer. TRUE!

Classical Conditioning of Emotional Responses Remove the fear from Peter – Counterconditioning – Flooding – Systematic desensitization

Operant Conditioning: Learning What Does What to What

Thorndike and Law of Effect Law of Effect – Response is strengthened by a reward – Response would not occur in ways that bring punishment

B.F. Skinner and Reinforcement Operant behavior Focused on measurable behaviors Skinner box – Experimental conditions can be maintained Reinforcer

A Rat in a “Skinner Box”

Operant Conditioning Organisms learn to engage in behavior that is reinforced

Truth or Fiction? During World War II, a psychologist created a missile that would use pigeons to guide the missile to its target.

Truth or Fiction? During World War II, a psychologist created a missile that would use pigeons to guide the missile to its target. TRUE!

Types of Reinforcements Positive reinforcer – Increase probability behavior will occur when it is added Negative reinforcer – Increase probability behavior will occur when it is removed

Positive Versus Negative Reinforcers

Immediate versus Delayed Reinforcers Immediate reinforcers are more effective than delayed – Short-term consequences are more of incentive than long-term

Primary and Secondary Reinforcers Primary reinforcer effective because of biological makeup of organism – Food, water, warmth, pain (negative reinforcer) Secondary reinforcer acquire value through association with established reinforcers – Conditioned reinforcers – Money – learn it may be exchanged for primary reinforcer

Extinction and Spontaneous Recovery in Operant Conditioning Extinction – Learned responses are extinguished after repeated performance without reinforcement – People can self-reinforce for some behaviors Spontaneous Recovery – Occurs as a function of time

Reinforcers versus Rewards and Punishment Reinforcers are known by their effect (increase response) Rewards are pleasant events that affect behavior Punishment are aversive events that decrease the frequency of the behavior they follow – Positive punishment – apply aversive stimulus – Negative punishment – remove pleasant stimulus

Negative Reinforcers Versus Punishment

Discriminative Stimuli Stimulus that indicates whether behavior will be reinforced – Behavior not reinforced tend to be extinguished

Schedules of Reinforcement Continuous reinforcement – Most rapid acquisition – Most easily extinguished Partial reinforcement – More resistant to extinction

Interval Schedules of Reinforcement Fixed-interval schedule – Fixed amount of time – Response rate falls off after each reinforcement and then picks up as reinforcer approaches Variable-interval schedule – Unpredictable time elapses – Steadier but lower response rate (than fixed- interval)

Truth or Fiction? Slot-machine players pop coins into the machines most rapidly when they have no idea when they might win.

Truth or Fiction? Slot-machine players pop coins into the machines most rapidly when they have no idea when they might win. TRUE!

Ratio Schedules of Reinforcement Fixed-ratio schedule – Fixed number of correct responses – High response rate; higher immediately after reinforcement Variable-ratio schedule – Unpredictable number of correct responses – High response rate

Truth or Fiction? You can train a rat to climb a ramp, cross a bridge, climb a ladder, pedal a toy car, and do several other tasks – all in proper sequence.

Truth or Fiction? You can train a rat to climb a ramp, cross a bridge, climb a ladder, pedal a toy car, and do several other tasks – all in proper sequence. TRUE!

Shaping Reinforce progressive steps toward the behavioral goal – As training proceeds, reinforce successive approximations of the goal

Truth or Fiction? You have to make mistakes to learn.

Truth or Fiction? You have to make mistakes to learn. FICTION!

Applications of Operant Conditioning Biofeedback Training Behavior Modification Programmed Learning

Cognitive Factors in Learning

Latent Learning and Cognitive Maps E. C. Tolman – Cognitive maps – Learning was hidden, or latent, until food motivated them

Contingency Theory Learning only occurs when CS provides information about the US – Rescorla – pairing tone (CS) with shock (US)

Observational Learning Acquire skills by observing others (Bandura) Can occur without overt responses – Paying attention to the behavior is sufficient – Learning may be latent Model – person who engages in response that is imitated – Vicarious reinforcement

Violence in the Media and Aggression Bandura and colleagues classic study of media violence – Bobo and preschool children – Children who saw aggressive model showed significantly more aggressive behavior toward the doll themselves

Classic Research on the Imitation of Aggressive Models

Truth or Fiction? Despite all the media hoopla, no scientific connection has been established between violence in the media and real-life aggression.

Truth or Fiction? Despite all the media hoopla, no scientific connection has been established between violence in the media and real-life aggression. FICTION!

Consensus on the Effects of Violence in the Media Depictions of violence contribute to aggression – Observational learning – Disinhibition – Increased emotional arousal – Priming of aggressive thoughts and memories – Habituation Circular relationship between exposure to media violence and aggressive behavior

What Are the Connections Between Media Violence and Aggressive Behavior?

Consensus on the Effects of Violence in the Media Family influences on imitation of media violence – Parental substance abuse, paternal physical punishments, single parenting Children who believe violence is inappropriate will be less aggressive

Teaching Children Not to Imitate Media Violence Inform children that – Media violence is not typical of most people – Media aggressive behaviors are not real – Most conflicts are resolved non-violently – In real-life violence has consequences