learning. define learning learning is a relatively permanent change in behavior as a result of...
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Learning
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Define Learning
Learning is a relatively permanent change in behavior as a result of experience.
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Classical Conditioning
In classical conditioning, we learn to associate two stimuli and anticipate events.
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For example, we learn that a flash of lightening signals an impending crack of thunder, so we start to brace ourselves when lightening flashes nearby.
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Two related events:
Lightning
Stimulus 1
Thunder
Stimulus 2
Result after repetition
We see lightning
Stimulus
We wince anticipatingthunder
Response
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Operant Conditioning
In operant conditioning, we learn to associate a response and its consequence, and we repeat acts followed by rewards, and avoid acts followed by punishment.
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For example, we learn that when we get good grades, we get money, so we continue to get good grades. Or, if we don’t get good grades, we lose privileges. To avoid losing privileges, we get good grades.
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Social/Vicarious/Observational Learning
In social learning (or observational learning), we learn from other’s experiences and examples.
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For example, chimpanzees sometimes learn behaviors merely by observing others perform them. If one animal watches another learn to solve a puzzle that gains a food reward, the observing animal may perform the trick as well, and even more quickly.
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Classical Conditioning
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Classical Conditioning Ivan Pavlov - Russian;
Medical doctor who spent two decades studying the digestive system. Nobel Prize in 1904. Studied learning for the next three decades, by “accident”.
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Classical Conditioning After studying salivary secretion in dogs, he
knew that when he put food in a dog’s mouth the animal would invariably salivate. He also began to notice that when he worked with the same dog repeatedly, the dog began salivating to stimuli associated with food – the sight of food, the food dish, the mere presence of the person bringing the food, even the sound of oncoming footsteps in anticipation of the food
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Classical Conditioning Pavlov’s Experiment: Through experimentation, Pavlov asked: If
a neutral stimulus (something the dog could see or hear) regularly signaled the arrival of food, would the dog associate the two stimuli (the food and the neutral stimuli)? If so, would the dog begin to salivate to the neutral stimulus in anticipation of the food?
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Classical Conditioning
Unconditioned StimulusA stimulus that naturally
and automatically triggers a response
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Classical Conditioning
Unconditioned Response The unlearned, naturally
occurring response to the unconditioned stimulus
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Classical Conditioning
For example:For Pavlov, the UCS was
food and the UCR was the dog’s salivation
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Classical Conditioning Pavlov’s Experiment (continued): Just before placing food in the dog’s
mouth to produce salivation, Pavlov sounded a tone. After several pairings of tone and food, the dog began to salivate to the tone alone, in anticipation of the food.
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Classical Conditioning
Conditioned Stimulus An originally irrelevant
stimulus that, after association with an unconditioned stimulus, comes to trigger a conditioned response
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Classical Conditioning
Conditioned ResponseThe learned response to a
previously neutral conditioned stimulus
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Classical Conditioning For example:
For Pavlov, the previously neutral stimulus was the tone. During conditioning, the tone was paired with the food (UCS). After conditioning, the tone, when presented alone, produced salivation in the dog. The tone is now considered the CS, and the dog’s salivation to the tone alone is now considered the CR.
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UCS(passionate kiss)
UCR(sexualarousal)
CS(onionbreath)
CS(onion breath)
CR(sexualarousal)
UCS(passionate Kiss)
UCR(sexualarousal)
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OH BABY !!!!
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UCS(drug)
UCR(nausea)
CS(waiting room)
CS(waitingroom)
CR(nausea)
UCS(drug)
UCR(nausea)
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1. While George was having a cavity filled by his dentist, the drill hit a nerve that had not been dulled by anesthetic, a couple of times. Each time he cringed in pain. George now gets anxious each time he sees the dentist.
What is the: Unconditioned stimulus: ____________________ Unconditioned response: ____________________ Conditioned stimulus: ____________________ Conditioned response: ____________________
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2. Every time a psychology instructor enters the classroom, she goes straight to the board to write an outline on it. Unfortunately, she has long finger nails and each time she writes the outline, her nails screech on the board, making students cringe. After a few weeks of this, students cringe at the sight of the teacher entering the classroom.
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3. Fanny eats fried chicken that has e coli in it and ends up vomiting for hours that night. Luckily she recovers within a day, but now just the thought (or the sight or the smell) of fried chicken makes her nauseous.
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4. At a football game, every time the home team scores a touchdown, the person behind you blasts an air horn near your ears causing you to wince. Unfortunately for you, the home team scores frequently. As the end of the game nears, the home team scores a touchdown, and even though the inconsiderate fan behind you has left, you still wince.
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5. LaToya’s husband puts on Polo cologne every time they’re going to be sexually intimate. Now when LaToya is walking through the mall and passes a stranger wearing Polo cologne, she becomes sexually aroused.
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6. Charlie has been humiliated in the past for doing poorly on tests. When that has happened, he would get so upset he would shake. Now when presented with a test, he begins to shake.
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Fred has a fluffy down pillow with some of the down sticking out of the fabric. When he first tries out the pillow, a piece of down tickles his nose and he sneezes. He now sneezes every time he lays down on any kind of pillow.
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It is springtime and the pollen from the flowers causes you to sneeze. Soon you are sneezing at the mere sight of a flower…real or fake.
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You ride a roller coaster and get sick afterward. Now, whenever you are near a roller coaster you feel queasy.
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Your relationship is going badly and your significant other has yelled at you without warning several times. You now feel tense and fearful any time that you are around him or her.
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Five Major Conditioning Processes
Acquisition Extinction Spontaneous Recovery Generalization Discrimination
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Acquisition The initial stage in classical
conditioning The phase associating a neutral
stimulus with an unconditioned stimulus so that the neutral stimulus comes to elicit a conditioned response
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Acquisition Findings:
The time between presenting the neutral stimulus and the unconditioned stimulus needs to be short. For most species and procedures, about ½ second works best.
Conditioning is more likely to occur if the conditioned stimulus is presented before the unconditioned stimulus
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Extinction and Spontaneous Recovery
After conditioning, what happens if the conditioned stimulus occurs repeatedly without the unconditioned stimulus…..will it continue to elicit the conditioned response?
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Extinction and Spontaneous Recovery
Extinction – the diminishing of a conditioned response when an unconditioned stimulus no longer follows a conditioned stimulus
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Extinction and Spontaneous Recovery
The reappearance, after a rest period, of an extinguished conditioned response.
The conditioned response continues to get weaker after less pairings of the CS and the UCS, and after more and more rest periods
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Pause
Acquisition(CS+UCS)
Extinction(CS alone)
Extinction(CS alone)
Spontaneousrecovery ofCR
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Generalization The tendency, once a response has been
conditioned, for stimuli similar to the conditioned stimulus to elicit similar responses IE. A child bitten by a dog may fear all dogs.
Children who fear moving cars in the street also fear trucks and motorcycles. After 9/11, many people responded anxiously when planes flew near by.
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Discrimination The learned ability to distinguish
between a conditioned stimulus and other stimuli that do not signal an unconditioned response IE. A child bitten by a dog now fears
all dogs. The same child learns, over time, that only certain types dogs should be feared (pit bull?), and others generally shouldn’t (golden retriever?).
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Classical Conditioning – Extra Little Albert Experiment – Fear Conditioning
An 11-month infant named Albert feared loud noises, but not white rats. In the experiment, when Albert was presented with a white rat and reached out to touch it, a hammer was struck on a steel beam behind his head. After seven repetitions of seeing the rat and then hearing the frightening noise, Albert burst into tears at the mere sight of the rat.
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Classical Conditioning - Extra
Five days after the testing, Albert showed generalization of his conditioned response by reacting with fear to a rabbit, a dog, and a sealskin coat.
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Operant Conditioning
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Operant Conditioning
Type of learning in which behavior is strengthened if followed by a reinforcer, or diminished if followed by a punisher
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Operant Conditioning B.F. Skinner’s Experiments:
Based on Edward Thorndike’s LAW OF EFFECT – states that rewarded behavior is likely to recur
Experiments conducted with animals in an operant chamber (Skinner Box) – a soundproof box, with a bar or key that an animal presses or pecks to release a reward of food or water
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Operant Conditioning
Shaping – while conditioning an animal to perform certain behaviors, reinforcers are successively given only as the subject gets closer to the ultimate behavior goal
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IE. If the purpose of putting a rat in a maze is to teach it to get from Point A to Point B while following a certain path, then every time the rat makes a turn towards the right path, a reward should be given. If it makes a turn towards the wrong path, NO reward is given.
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Operant Conditioning
If we can shape animals to respond to one stimulus and not to another, then obviously they can perceive the differences.
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IE. Some pigeons have been trained to be able to distinguish between Bach and Stravinsky.
IE. If the goal of a teacher is to get all students to strive for 100% accuracy on their spelling tests, then every time a student improves on successive spelling tests they should be rewarded. NOT just reward those that get a 100%.
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Operant Conditioning
Reinforcement – any event that increases the frequency of a preceding response, or strengthens the behavior that it follows
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IE. Being able to borrow the car after the dishes are done will increase the likelihood that you will do the dishes again.
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Operant Conditioning Positive Reinforcement –
strengthens a response by presenting a typically pleasurable stimulus after a response. IE. Food for a hungry animal.
Attention, approval, money for people.
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Operant Conditioning
Negative Reinforcement – strengthens a response by reducing or removing an aversive stimulus
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IE. Taking aspirin to relieve a headache will increase the behavior of taking aspirin because it reduces or eliminates the pain. Smoking a cigarette to relieve stress will increase the behavior of smoking because it reduces or eliminates anxiety and pressure.
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Operant Conditioning
Positive ADDS a desirable stimulus, like getting a hug or watching t.v.
Negative REMOVES an aversive stimulus, like fastening a seatbelt to stop the annoying beeping
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Operant Conditioning Primary Reinforcers –one that
primarily satisfies a biological need
Conditioned or Secondary Reinforcers – a stimulus that is learned, and/or is associated with a primary reinforcer
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IE. Primary reinforcers may be food, or pain relief. Secondary reinforcers may be money, praise, good grades, a pleasant tone of voice.
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Operant Conditioning Immediate and Delayed Reinforcers –
How quickly does a reinforcement needed to be given after a desired behavior has been exhibited in order for the behavior to be conditioned? How often does the reinforcement need to be given to condition proper behavior?
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Operant Conditioning Continuous Reinforcement –
Reinforcing the desired response immediately, every time it occurs. Learning occurs quickly, but as soon as reinforcement ends, extinction occurs very quickly also.
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You go to the same soda machine every day, put your money into it, and it delivers a soda. On Friday, you put your money into it and it doesn’t work. Same thing Saturday. You stop using the machine, though a week later you may try again.
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Operant Conditioning
Partial (Intermittent) Reinforcement – Reinforcing a response only part of the time. This results in slower acquisition of a response, but much greater resistance to extinction also.
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IE. Slot machines. You may win only once in long while, but you’ll keep playing because the reinforcement is worth it, and the habit may last a long time.
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Operant Conditioning Partial (Intermittent) Reinforcement
Schedules: Fixed-Ratio = a schedule of
reinforcement that reinforces only after a specified number of responses. IE. Every 10th sale gets a prize.
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Operant Conditioning Partial (Intermittent) Reinforcement
Schedules: Variable-Ratio Schedule = a
schedule of reinforcement that reinforces a response after an unpredictable number of responses IE. Slot machines, fishing.
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Operant Conditioning Partial (Intermittent) Reinforcement
Schedules: Fixed-interval schedules = a schedule
of reinforcement that reinforces a response only after a specified time has elapsed IE. At the end of every 30 minutes a
new batch of cookies will be baked.
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Operant Conditioning Partial (Intermittent) Reinforcement Schedules:
Variable-Interval Schedules = a schedule of reinforcement that reinforces a response at unpredictable time intervals IE. “You’ve Got Mail”…you don’t
know when you will get an email, but you are always checking for it.
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Operant Conditioning Punishment – An event that
decreases the behavior that it follows May be done by administering an
undesirable consequence, or by withdrawing a desirable consequence
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IE. Shock treatment and spanking are added, undesirable consequences, while taking away phone or car privileges withdraws desirable consequences.
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Operant Conditioning Issues/Questions regarding punishments
Physical punishments are not forgotten, just suppressed
Physical punishments may increase aggressiveness by demonstrating that aggression is a way to cope with problems
Punishments may create fear
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Operant Conditioning If punishment isn’t delivered swiftly,
or proportionally with regards to the crime, those punished may be confused, depressed, or helpless
Punishments still do not teach the proper behavior – it only suppresses unwanted behaviors
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Observational Learning
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Observational Learning
Observational Learning is learning by watching and imitating others
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Observational Learning
For example, a child sees his big sister burn her fingers on the stove has thereby learned not to touch it.
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Observational Learning
Modeling is the process of observing and imitating a specific behavior
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Observational Learning
Pro-Social Models exemplify positive, constructive, helpful behavior. Anti-Social Models exemplify negative and hurtful behavior.
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Observational Learning
Mirror Neurons in the frontal lobe are partially responsible for allowing humans to imitate simple language and emotions
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Observational Learning
Albert Bandura’s Experiment – The Bobo Doll Children exposed to an adult
taking out their frustrations on a Bobo doll would imitate their punches and kicks when presented with a Bobo doll when they were frustrated.
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Bobo Doll Experiments Three experimental conditions: The model was praised. The model was punished. The model received no
consequences for the aggressive behavior.
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Vicarious Learning Learning by seeing the
consequence of another’s behavior
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Modeling Requirements Bandura suggests four requirements for effective modeling to occur: Attention Retention Ability to reproduce the behavior Motivation
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Bobo Doll Experiment
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Observational Learning in Everyday Life
Module 17: Observational Learning
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Antisocial/Prosocial Behavior Antisocial behavior - negative,
destructive unhelpful behavior Prosocial behavior – positive,
constructive, helpful behavior Both types of behavior can be
modeled effectively.