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Chapter 7: Learning 1 What is learning? A relatively permanent change in behavior due to experience First test - purpose? To assess learning First test.

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Presentation on theme: "Chapter 7: Learning 1 What is learning? A relatively permanent change in behavior due to experience First test - purpose? To assess learning First test."— Presentation transcript:


2 Chapter 7: Learning 1

3 What is learning? A relatively permanent change in behavior due to experience First test - purpose? To assess learning First test in relation to the definition of learning. 2

4 Three types of learning:  Classical Conditioning  Operant Conditioning  Learning by Observation (Observational Learning) Classical Conditioning A type of learning in which the learner comes to associate two stimuli. 3

5 4 Classical Conditioning Pavlov - Russian physiologist. Studied physiological responses in dogs. Question? Hypothesis: If a neutral stimulus is paired with a stimulus which automatically produces a response, then the neutral stimulus comes to produce the same response.

6 5 Conditioned Stimulus (N) Unconditioned Stimulus Food Unconditioned Response Bell/buzzer Salivation Conditioned Response Salivation  Pavlov’s Experiments Extinction - the dying out of a response due to non-reinforcement.

7 6 Generalization - responding to a stimulus similar to but not exactly like the original conditioned stimulus Beep/boop Stimulus Discrimination - learning to respond to one stimulus but not another Classical Conditioning and human learning John Watson in early 1900’s Famous “Little Albert” experiment.

8 7 Conditioned Stimulus (N) Unconditioned Stimulus Loud Noise Unconditioned Response White Rat Fear Conditioned Response Fear  Little Albert Experiment Could Watson have deconditioned “little Albert”? Possibly so, but he did not get the opportunity.

9 8 Conditioned Stimulus (N) Unconditioned Stimulus Food Friend Fun Unconditioned Response White Rabbit No Fear Positive Feeling Conditioned Response Positive Feeling  Mary Jones - Peter Peter was afraid of a white rabbit She decided to decondition Peter so he would no longer fear the white rabbit Used classical conditioning principles.

10 Updating Pavlov’s Understanding Cognitive Processes. What may be learned is a mental expectancy animal expects that food will follow the bell Thus, the dog anticipates and salivates to the bell. 9

11 Biological Predispositions. At one time, it was thought that any stimulus could be used as a conditioned stimulus with equal success However, John Garcia working with rats did not find support for this He used three stimuli as CSs: - a sound - a sight (something the animal saw) - a taste (something with a distinctive taste). 10

12 For example: 11 a sound a picture bad tasting water radiation treatment sickness CSUCS UCR Which of these CSs will result in avoidance behavior in the rat? Why? Biological predisposition.

13 12 What do humans learn through classical conditioning that is significant to personality? Examples Assume little Johnny is afraid to go to the doctor’s office. What would the CS, UCS, UCR, and CR be? CS - _________; UCS - __________ UCR - _________; CR - __________

14 Operant Conditioning B.F. Skinner Involves operant behavior Implies operate as in operating or behaving Behavior operates on the environment to produce consequences. 13

15 What consequences occur after we behave? Rewards (reinforcement) or punishment Reinforcement - that which follows behavior and makes that behavior more likely to occur again Effect of reinforcement - increases rate of responding Two types of reinforcement:  positive reinforcement  negative reinforcement. 14

16 15 Positive Reinforcement Positive Reinforcement - something positive or pleasant is added to the environment after a response Is positive reinforcement if... it increases rate of responding Rat in Skinner box When would shaping be used? To condition complex behavior. Another Example. Primary and secondary reinforcers Shaping - reinforcing successive approximations of the desired response

17 16 Schedules of Reinforcement Continuous schedule Partial schedules: 1. Fixed ratio (FR) 2. Variable ratio (VR) 3. Fixed interval (FI) 4.Variable interval (VI) Why did Skinner study different schedules of reinforcement? To determine what effect different schedules have on rate of responding.

18 17 Negative Reinforcement What effect does negative reinforcement have on rate of responding? Increases rate of responding Remember: reinforcement, whether positive or negative, increases rate of responding How would you get a rat in a Skinner box to press the lever using negative reinforcement?

19 18 Negative reinforcement - removing something aversive (unpleasant) after a response has been made. Is negative reinforcement if it increases rate of responding Thus, to use negative reinforcement – must have something aversive which can be removed Give examples using human behavior.

20 19 Punishment What effect does punishment have on rate of responding? Punishment decreases rate of responding Two types of punishment: 1) Adding something aversive to the environment after a response has been made. Is punishment if it... decreases rate of responding. Examples.

21 20 2) Removing something pleasant (reinforcing) after a response has been made. Is punishment if it... decreases rate of responding Examples Drawbacks to punishment: 1) Punished behavior is not forgotten, but suppressed. Child learns when misbehavior will and will not be punished 2) If behavior is only occasionally followed by something aversive, rate of responding may not decrease. Example.

22 21 3) Can create fear by process of association (classical conditioning) 4) May provide a model of aggression as a way to deal with problems 5) Does not tell a child what to do, rather it communicates what not to do. Thus, mild punishment combined with reinforcement for appropriate behavior is usually advocated.

23 Updating Skinner’s Understanding Cognitive Processes Learning can occur without reinforcement Latent learning – learning exhibited long after learning has occurred. Stored in memory & used later. Overjustification Effect - giving a reward for engaging in behavior that one already likes to do – may make behavior less likely. Biological Predisposition. 22

24 Comparing Classical and Operant Conditioning Both involve learning by association In classical conditioning, we learn to associate two stimuli (a CS and a UCS) In operant conditioning, we learn to associate a response and its consequence and thus... repeat acts followed by rewards and avoid acts followed by punishment. 23

25 Observational Learning We imitate our models Soon after birth… p. 342 Observational learning - Albert Bandura Learning by observing others Modeling - process of observing and imitating a specific behavior. 24

26 25 Bandura’s Classic Bobo Doll Experiment: Bandura made a film with aggressive model attacking a Bobo doll Punched doll, hit doll with hammer, kicked doll Nursery school children randomly assigned to one of three groups 1. Model rewarded group 2. Model punished group 3. No consequence group.

27 26 After viewing model (film), each child was allowed to play in playroom Dependent variable - aggressive behavior Which group was more likely to imitate the aggressive model’s behavior? It was the model rewarded group and also the no consequence group Implications for our society today.

28 Things you would want to do if you wanted to create a violent society: 1. Expose children from little up to much violent behavior which is portrayed in an exciting way (aggressive models) 2. Allow these children to play violent video games where killing is rewarded and fun 3. This may desensitize children to violence- it’s not so bad, it’s even fun. 27

29 4. Provide young people with easy access 5. Frustrate and ostracize young people so they are loners, not a part of in-group 6. Do not teach children to value human life and to respect others. 28

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