theories of personality - d. fry science -...
TRANSCRIPT
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Learning
chapter 9
Learning Objectives:
1. What are the two types of stimuli and responses that
form the basis of classical conditioning?
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Behaviorism • Part of the LEARNING PERSPECTIVE
• Focus on observable behaviors, rather than what goes on in the mind
• The environment determines our behaviors • Conditioning = the association between environmental stimuli
and behavioral responses
• Learning = conditioning • Classical conditioning
• Operant conditioning
• John Watson • Founded behaviorism
• Psychology should only consider observable behaviors, so humans can be studied objectively
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John Watson
Famous Quote:
“Give me a dozen healthy infants, well-formed, and my own special world to bring them up in, and I’ll guarantee to take any one at random and train him to be any type of specialist I might select—doctor, lawyer, artist, merchant-chief, and yes, beggar-man and thief, regardless of his talents, penchants, tendencies, abilities, vocations, and race of his ancestors.”
chapter 9
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Definitions
• What is Learning? • A relatively permanent change in behavior due to experience
• What is Conditioning? • The association between environmental stimuli and the
organism’s responses
chapter 9
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Classical conditioning
The process by which a previously neutral stimulus
acquires the capacity to elicit a response
through association with a stimulus
that already elicits a similar response
chapter 9
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Classical conditioning
chapter 9
Ivan Pavlov
• studies on dog salivation
• observed that dogs salivated BEFORE food was placed in its mouth
• conditional “reflex”
Translated into conditioned
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Classical Conditioning
Unconditioned stimulus (US)
Elicits a response in the absence of learning
Unconditioned response (UR)
The reflexive response to a stimulus in the absence of learning
chapter 9
S-R Pair that is instinctive/innate
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Classical Conditioning
Learning occurs when a neutral stimulus is then regularly paired with an unconditioned stimulus.
chapter 9
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Classical Conditioning
Conditioned stimulus (CS)
An initially neutral stimulus that comes to elicit a conditioned response after being paired with an unconditioned stimulus
Conditioned response (CR)
A response that is elicited by the conditioned stimulus
– Occurs after the CS has been
associated with the US
– Similar to the US
– A learned response
chapter 9
S-R Pair is learned
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Classical Conditioning: Eye-Blink Experiment
chapter 9
whistle Puff of air from
straw Eye-blink
What are the unconditioned stimulus (US) and
unconditioned response (UR) ?
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Classical Conditioning: Eye-Blink Experiment
chapter 9
Puff of air from
straw Eye-blink
US UR
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Classical Conditioning: Eye-Blink Experiment
chapter 9
whistle Puff of air from
straw Eye-blink
What are the conditioned stimulus and
conditioned response?
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Classical Conditioning: Eye-Blink Experiment
chapter 9
whistle Puff of air from
straw Eye-blink
Neutral Stimulus US UR
+
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Classical Conditioning: Eye-Blink Experiment
chapter 9
whistle Eye-blink
CS CR
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Another example
When Alan feeds his fish, he first turns on the aquarium light and then puts in the fish food. After a while he notices that they swim to the top as soon as he turns on the aquarium light. What is the conditioned stimulus
1. Fish food
2. The aquarium light
3. The aquarium
4. Alan
chapter 9
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Last Class in Review
• Behaviorism (learning perspective) • Observable behaviors
• Learning = Conditioning
– Environment determines behaviors
• John Watson
• Learning – Relatively permanent change in behavior
• Classical Conditioning – Unconditioned Stimulus – elicits reflexive behavior
– Unconditioned Response – reflexive behavior
– Conditioned Stimulus – elicits learned behavior
– Conditioned Response – learned behavior
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Learning
chapter 9
Learning Objectives:
1. How does the process of extinction work in classical
conditioning? What is spontaneous recovery?
2. What do stimulus generalization and discrimination
refer to in classical conditioning?
3. How can classical conditioning help us to learn
emotional responses to objects, people, and places?
4. How do the principles of classical conditioning
contribute to food aversions and reactions to medical
treatments?
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Classical Conditioning
Review • Geraldine has an automobile accident at the corner of 32nd street and
Cherry Ave. Whenever she approaches the intersection now, she begins to feel uncomfortable; her heart begins to beat faster, she gets butterflies in her stomach, and her palms become sweaty.
– US:
– UR:
– CS:
– CR:
• Calvin was chased and assaulted by an aggressive rooster when he was barely three years old. As an adult he still gets little blips in his stomach when he hears the word rooster and he claims that birds make
him nervous.
– US:
– UR:
– CS:
– CR:
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Principles of classical conditioning
Extinction
Spontaneous recovery
Higher-order conditioning
Stimulus generalization
Stimulus discrimination
chapter 9
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Extinction
chapter 9
Whistle
CS
Eye-blink
CR
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Extinction
The weakening and eventual
disappearance of a learned
response
In classical conditioning, it
occurs when the conditioned
stimulus is no longer paired
with the unconditioned
stimulus.
chapter 9
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Extinction
The weakening and eventual
disappearance of a learned
response
In classical conditioning, it
occurs when the conditioned
stimulus is no longer paired
with the unconditioned
stimulus.
chapter 9
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Spontaneous Recovery
• The reappearance of a learned response after its apparent extinction
• Eye-Blink Example: We extinguished your learned response of eye-blinking
(CR) to a whistle by not pairing the whistle (CS) with the puff of air (US); however, if tomorrow you are walking down the street and hear a policeman blow a whistle your eye might blink (CR). This would be spontaneous recovery, or the reappearance of a response, after extinction has occurred.
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Higher-order conditioning
A neutral stimulus can become a conditioned stimulus by being paired with an existing conditioned stimulus.
chapter 9
Neutral stimulus
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Higher-order conditioning
A neutral stimulus can become a conditioned stimulus by being paired with an existing conditioned stimulus.
chapter 9
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Stimulus generalization
In classical conditioning, occurs when a new stimulus that resembles the conditioned stimulus elicits the conditioned response
chapter 9
Teapot
whistle
Similar to
CS
Eye-blink
CR
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Stimulus discrimination The tendency to respond differently to two or more similar stimuli
In classical conditioning, occurs when a stimulus similar to the conditioned stimulus fails to evoke a conditioned response
chapter 9
Train
whistle
Similar to
CS
Eye-blink
CR does
not occur
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What is learned in classical conditioning?
We learn that the first stimulus predicts the second.
For classical conditioning to be most effective, the stimulus to be conditioned should precede the unconditioned stimulus.
chapter 9
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Learning to like
Where do sentimental feelings come from?
Objects have been associated in the past with positive feelings.
chapter 9
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Classical Conditioning and Emotions
chapter 9
Neutral Stimulus
Pre-9/11
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Classical Conditioning and Emotions
chapter 9
Neutral Stimulus
Events of 9/11
Sadness
Anxiety
Fear
US
UR
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Classical Conditioning and Emotions
chapter 9
CS
Sadness
Anxiety
Fear
CR
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Classical Conditioning in Advertisements
Advertisers use attractive women, pop icons, and popular music to attract us to products
chapter 9
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Learning to fear We can learn fear through association.
Phobias
“Little Albert” experiment –
- Watson and Raynor
- Established rat phobia in 11-month old boy though classical conditioning
- Fear generalized to other furry objects (stimulus generalization)
chapter 9
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Unlearning fear
Counterconditioning The process of pairing a conditioned stimulus with a stimulus that elicits an incompatible response.
chapter 9
Systematic Desensitization A variation on counterconditioning developed for the treatment of phobias
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Rod’s Story From the time he was 5, Rod’s favorite food was peanut butter. Some days he
would eat it right out of the jar. Other days he would make elaborate
sandwiches with layers of peanut butter, jelly and bananas. His mother would
allow him to eat only 2 of these at any one time. There were days when Rod
waited for hours to have his peanut butter at night, on top of ice cream. He
would keep eating the peanut butter off the top and piling on more, until his
mom said, “That’s enough, Rod”. Rod’s favorite times were when he and his
dog would eat peanut butter together. He would take a spoonful for himself and
give one to the dog. The only thing that stopped him from eating the whole
thing was his mother’s warning that it would make the dog sick.
Then came a day when his mom was called to help a neighbor and told Rod “I’ll
be back in an hour. You be good”. Rod new exactly what he would do, he got
out a full jar of Peanut butter, a spoon, and sat down with his dog. They ate the
PB spoonful by spoonful until the jar was al gone. When Rod’s mother
returned she found him on the couch. He said he felt sick and the dog looked
sick too. As Rod became more nauseated, he had to vomit. For the first time
in his entire life he hated the taste of PB. He couldn’t even stand the thought of
eating it. Ten years passed before he was able to eat it again. Although he can
eat it now, his passion for it has never returned. Adapted from Rod Plotnick, Intro to Psychology 2nd edition
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Taste Aversions Food Aversions - What are the unconditioned stimulus
and unconditioned response?
- What are the conditioned stimulus and
conditioned response?
chapter 9
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Classical conditioning and medical treatments
Cancer patients undergoing chemotherapy often react to waiting rooms with nausea
Why?
What are the conditioned stimulus and conditioned response?
What are the unconditioned stimulus and response?
How might placebos sometimes give patients real relief?
chapter 9
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Applying Classical Conditioning
• While caring for your friend’s dog, you notice that it displays a fear-like posture as you roll up the newspaper. You try this several more times and become convinced that this dog is generally afraid of the rolled-up newspapers
US:
UR:
CS
CR:
• If the dog was also afraid of magazines (and wasn’t ever hit with a magazine), what might this be an example of
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Applying Classical Conditioning
• Joan, an animal trainer, has been phobic about monkeys since an earlier attack. However, because of the money, she has agreed to work with monkeys for a movie studio. At first, just going anywhere near the cages makes Joan tense, sweaty, and apprehensive. Lately though things have changed. Working with such cuddly, affectionate, human-like creatures is causing Joan to wonder why she ever felt such extreme distress.
US:
UR:
CS:
CR:
• What other principles of classical conditioning are at play here?
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Applying Classical Conditioning
• At a red light, Bob and Fred automatically tensed and felt chills when they heard the screech of tires behind them. Later, while watching a car race, Bob remarked how the screeching of tires was having little effect on him. Fred agreed and wondered why they reacted at all, because neither had as much as a dent on his driving record.
• What principles of classical conditioning do you see here?
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Applying Classical Conditioning
• Early in their relationship, the mere sight of Donna excited Jack. This gradually died out; however, as Donna behaved tolerantly, but indifferently. When the relationship ended, Jack was bored with Donna and didn’t even think about her for the next year. Now, he was surprised at how excited he was becoming at seeing Donna through the window of a bus.
US:
UR
CS:
CR:
• What principles of classical conditioning do you see here?
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Applying Classical Conditioning
• Bill couldn’t ever remember being so sick and nauseated. He would never go to that restaurant again or eat chicken again. All he could think about was the good dinner his mother was going to prepare for his homecoming. When he walked in the kitchen, he became flushed and felt nauseated when he saw a brown turkey sitting on the dinner table.
US:
UR:
CS:
CR:
• What principles of classical conditioning do you see here?
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Last Class in Review • Principles of Classical Conditioning
– Extinction
• CS is no longer paired with US and the CR eventually disappears
– Spontaneous Recovery
• Reappearance of CR after apparent extinction
– Higher-order conditioning
• Pairing of a neutral stimulus with CS, where neutral stimulus become new CS
– Stimulus generalization
• When a stimulus that is different, but similar to CS, elicits the CR
– Stimulus Discrimination
• When a stimulus that is similar to the CS, fails to elicit the CR
• What is learned with Classical Conditioning
– That 1 stimulus predicts a second
– Emotions
• Learning to like –objects and places evoke emotions, advertisements
• Learning to fear – “Little Albert” experiment
– Counterconditioning
• Taste Aversions
• Medical Treatments
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Operant Conditioning • Learning Objectives:
1. What are 3 types of consequences that a behavior might produce?
2. What is the difference between positive reinforcement and negative reinforcement in operant conditioning?
3. How do extinction, generalization, and discrimination take place in operant conditioning? How are these processes different than in classical conditioning?
4. What is the difference between a continuous and intermittent schedule of reinforcement?
5. How could you use shaping of approximations to train a chicken to play tic-tac-toe?
6. What are 6 reasons punishments usually fail to change behavior?
7. Under what circumstances might rewards backfire?
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Operant conditioning (aka Instrumental Learning)
The process by which a response/behavior becomes more or less likely to occur depending on its consequences
chapter 9
Let’s consider our example:
John’s behavior (choosing the apple) became MORE likely because of the consequence (getting praise and a toy)
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Operant conditioning (aka Instrumental Learning)
chapter 9
How is this different than Classical Conditioning?
- For classical conditioning it does NOT matter what happens after the behavior
- Classical conditioning more reflexive
- Operant conditioning more complex and voluntary
- “operating” on the environment
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Operant Conditioning: Edward Thorndike (1874-1949)
• Famous experiment
– How cats escape from puzzle boxes
• Law of Effect
– Responses closely followed by satisfying
consequences are more likely to recur
– Responses followed by aversive
consequences are less likely to recur
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Operant Conditioning: B.F. Skinner (1904-1990)
• Radical Behavioralism
– Reworked Thorndike’s Law of Effect into
Operant Conditioning
– Distinguished from John Watson and
Classical Conditioning
– To understand behavior we must focus on
the external causes and consequences
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Consequences of behavior 1. Neutral consequence:
neither increases nor decreases the probability that the response will recur.
2. Reinforcement: strengthens the response or makes it more likely to recur
3. Punishment: weakens a response or makes it less likely to recur
chapter 9
Detention
Response becomes
less likely
Sleeping in class
Response become
more likely
Using the potty
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Reinforcement
A stimulus strengthens or increases the probability of the response that it follows.
Primary reinforcers are inherently reinforcing and typically satisfy a physiological need.
- Food, water, caressing, comfortable air temperature
Secondary reinforcers are stimuli that have acquired reinforcing properties through associations with other reinforcers.
- money, praise, good grades, awards
chapter 9
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Types of reinforcement
Positive reinforcement (+)
When a pleasant consequence follows a response, making the response more likely to recur.
Negative reinforcement (-)
When an unpleasant consequence is removed following a response, making the response more likely to recur.
chapter 9
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Types of reinforcement
Positive reinforcement (+)
When a pleasant consequence follows a response, making the response more likely to recur.
Negative reinforcement (-)
When an unpleasant consequence is removed following a response, making the response more likely to recur.
chapter 9
Toy = pleasant
consequence John is more
likely to choose
the apple in the
future
Aspirin removed
headache (unpleasant
event)
Teacher more likely
to take aspirin in the
future
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Punishment
The process by which a stimulus weakens or reduces the probability of the response that it follows.
Primary punishers are inherently punishing.
- pain (e.g. hitting), extreme heat/cold
Secondary punishers are stimuli that have acquired punishing properties through associations with other punishers.
- criticism, demerits, scolding, bad grades, fines
chapter 9
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Types of punishment
Positive punishment
When an unpleasant consequence follows a response, making the response less likely to recur.
Negative punishment
When an pleasant consequence is removed following a response, making the response less likely to recur.
chapter 9
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Types of punishment
Positive punishment
When an unpleasant consequence follows a response, making the response less likely to recur.
Negative punishment
When an pleasant consequence is removed following a response, making the response less likely to recur.
chapter 9
Jail = unpleasant
consequence
Man less likely to
commit crime again
Aggressive Behavior Aggressive Behavior
less likely
Time Out = Removal of
pleasant consequences
(toys, time with friends)
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Rewards and Punishments Reinforcement Punishment
Positive
(adding)
Giving a
pleasant
consequence
Giving an
unpleasant
consequence
Negative
(subtracting)
Taking away an
unpleasant
consequence
Taking away a
pleasant
consequence
Increase Response
Decrease Response
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Rewards and Punishments Increase Behavior Decrease Behavior
Positive
Stimulus
Positive
Reinforcement
(add stimulus)
Negative
Punishment
(remove stimulus)
Negative
Stimulus
Negative
Reinforcement
(remove stimulus)
Positive
Punishment
(add stimulus)
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Your turn
Your first time camping in the woods, you are bitten over 45 times by mosquitoes, resulting in lots of swollen, itchy bumps on your arms, legs, and back. You never want to go camping again. What kind of consequence did you confront on your first camping experience?
1. Positive reinforcement
2. Negative reinforcement
3. Positive punishment
4. Negative punishment
chapter 9
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The Skinner box
chapter 9
A cage equipped with device that delivers food or water
when an animal makes a desired response
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The Skinner box
chapter 9
• At first the animal accidentally presses the lever and is rewarded with food or
water
• After this behavior occurs accidentally several times, the animal learns that if
he presses the lever, food will follow
•The behavior (pressing the lever) increases because food is a reinforcement
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Principles of operant conditioning
Extinction In operant conditioning, occurs when a response is no longer followed by a reinforcer
“My first extinction curve showed up by accident. A rat was pressing the lever in an experiment on satiation when the pellet dispenser jammed. I was not there at the time, and when I returned I found a beautiful curve. The rat had gone on pressing although no pellets were received.…”
B.F. Skinner
Spontaneous Recovery
The reappearance of a learned and extinguished behavior
chapter 9
No
toy
Apple choosing behavior
decreases and eventually
disappears
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Principles of operant conditioning
Stimulus generalization
The tendency for a behavioral response that has been reinforced (or punished) in the presence of one stimulus to occur (or be suppressed) in the presence of a similar stimulus
Stimulus discrimination
The tendency of responses to occur in the presence of one stimulus but not another that differs from it on some dimension
chapter 9
Substitute teacher (stimulus similar to
regular teacher)
Aunt Martha
(stimulus different
than teacher)
Behavior
doesn’t
occur
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Principles of operant conditioning
Stimulus generalization
Stimulus discrimination
To teach stimulus discrimination:
chapter 9
Pigeon pecks to get reward
in response to both circle
(original stimulus) and oval
(similar stimulus)
Pigeon learns to
discriminate between the 2
stimuli and peck only in
when the circle is shown FOOD NO
FOOD
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Schedules of reinforcement
Continuous Every occurrence of a response is reinforced.
- learning is most rapid
- extinction rapid
Intermittent (partial)
Only some occurrences of a response are reinforced.
- Response more resistant to extinction
- Fixed-ratio, fixed-interval, variable-ratio, variable-interval
chapter 9
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Schedules of reinforcement
Simple reinforcement schedules produce characteristic response patterns.
chapter 9
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Continuous vs. Partial reinforcement and Extinction
chapter 9
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Intermittent Reinforcement Schedules
• Can you think of any behaviors that might be explained by intermittent reinforcement? – Lucky charms/Superstitions
• a batter wears a certain hat and gets a home run
• a gambler lights up a cigarette and gets blackjack
• “Find a penny pick it up, all the day you’ll have good luck”
– Why are these so resistant to extinction? • They are reinforced on an intermittent schedule
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Shaping
An operant conditioning procedure used to teach complex behaviors by reinforcing successive approximations of a desired response
• Getting an animal to do tricks
• Getting a toddler to say water
– Successive Approximations • Behavioral responses that are reinforced that are increasingly similar
to the desired response
Instinctive drift: the tendency for an organism
to revert to instinctive behavior
chapter 9
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Behavior modification (aka applied behavioral analysis)
The application of operant conditioning techniques in a real-world setting To teach new responses
To reduce or eliminate maladaptive or problematic behavior
What types of situations might this be used in? • Toilet Training
• Elimination of bad habits (smoking, nail biting)
• Therapy for autistics
chapter 9
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Behavior modification for Autism (adapted from Lovas, 1981)
1. Select a target behavior (making eye contact)
2. Have child sit in chair facing you
3. Give command “Look at me” every 5-10 seconds
4. Reward the child with praise and food for correctly looking you
• Remember successive approximations
5. Repeat step 3 until the child is repeatedly following the command “Look at me”.
6. Gradually increase the duration of eye contact to 2-3 second with praise throughout the time at first and then only after the requisite amount of time has passed.
chapter 9
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What conditions are needed for punishment to work?
1. It needs to immediately follow the behavior
2. It is better if it is mild rather than harsh
3. It needs to be consistent
chapter 9
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Why do punishments often fail?
1. If the punishment is administered inappropriately • Blind rage, shouting obscenities
2. When the recipient responds with anxiety, fear, or rage • Classical conditioning may cause the punishment to generalize to
the place, person, or circumstances surrounding the punishment
3. Punishments are often only effective temporarily or under certain circumstances
• Only when parents are around
4. When it does not immediately follow the behavior
5. When it does not inform the recipient how it might be avoided in the future
6. When a consequence thought to be a punishment proves to be reinforcing
chapter 9
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When are rewards bad?
If external reinforcers undermine internal reinforcers
External reinforcers Reinforcers not inherently related to the behavior being reinforced
- money, praise, gold stars
Internal reinforcers Reinforcers inherently related to the behavior being reinforced
- enjoyment, satisfaction
chapter 9
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Last Class in Review • Operant Conditioning
– The process through which a behavior becomes more or less likely depending on its consequences
– Edward Thorndike
• Cat puzzle boxes
• Law of Effect
– BF Skinner
• Radical behavioralism
• Skinner box
– Consequences of Behavior
• Neutral
• Reinforcement – increases behavior (Positive vs Negative, Primary vs Secondary)
• Punishment – decreases behavior (Positive vs. Negative, Primary vs Secondary)
– Principles of Operant Conditioning
• Extinction, Stimulus Generalization, Stimulus Discrimination, Schedules of Reinforcement, Shaping (Behavior Modification)
– Conditions needed for Punishments to work
• Why punishments fail
• When are rewards bad
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Learning Objectives
• Learning (finishing up) 1. What is latent learning and observational learning?
2. What did the Bobo Doll Study show?
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Operant Conditioning Review
• Tim asks his mom for a toy at the store. She says no. Tim starts to scream and cry and continues to do so until his mom gets him a toy. Immediately upon receiving the toy, Tim stops crying. In this example what is the positive reinforcement and negative reinforcement?
– Positive reinforcement:
– Negative reinforcement:
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Operant Conditioning Review
• Jenny and Johnny’s moms are both trying to potty train their children. Jenny’s mom gives Jenny a cookie everytime she goes on the potty, while Johnny’s mom give Johnny a sticker and praise everytime he goes on the potty. Who is using the primary reinforcer and who is using the secondary reinforcer?
– Primary reinforcer:
– Secondary reinforcer:
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Moving on from Behaviorism
• Edward Tolman
Which way
should I go?
Where is that
cheese?
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Latent learning Tolman & Honzik experiment:
3 groups of rats in maze:
1. Always found food at end of maze
2. Never found food
3. No food for 10 days, 11th day received food
Learning is not ALWAYS immediately expressed in performance
chapter 9
A form of learning that is not
immediately expressed as an
overt response, it occurs
without obvious reinforcement
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Social learning theory
Social cognitive theories emphasize how behavior is learned and maintained.
We learn through observation and imitation of others in a social context
Emphasis on cognitive processes such as plans, expectations, and beliefs
Agree with Behaviorists that learning occurs through operant and classical
conditioning
BUT ADD that for humans cognitive processes (plans,
expectations, beliefs) affect how we learn and what information
we learn
chapter 9
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Observational Learning
Observational learning involves learning new responses by observing the behavior of another rather than through direct experience
- knowledge results from seeing a model behave in certain ways and experiencing the consequences
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Bandura’s Bobo doll study
Nursery school children watched a film of two men
(Johnny and Rocky) playing with toys.
Johnny refuses to share, and Rocky hits him, getting
all the toys.
Children who watched the video were significantly
more violent afterward than children in a control
group.
chapter 9