Organic Name Reactions for the students and aspirants of Chemistry12th.pptx
Aguiar ap learning 2014 2015 copy
1. 1: Classical Conditioning Part 1
• Learning Goals:
– Students should be able to answer the following:
1. What is classical conditioning, and how did Pavlov’s work influence behaviorism?
2. How does a neutral stimulus become a conditioned stimulus?
1
Rating Student Evidence
4.0
Expert
I can teach someone else about Palov’s influence
in the process of learning. In addition to 3.0 , I
can demonstrate applications and inferences
beyond what was taught
3.0
Proficient
I can analyze Palov’s influence in the process of
learning, and compare/contrast the Aspects of
the learning goal.
2.0
Developing
I can identify terms associated with Palov’s
influence in the process of learning, but need to
review this concept more.
1.0
Beginning
I don’t understand this concept and need help!
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Pavlov’ Study: Terminology
Neutral Stimulus (NS)- in classical conditioning, a stimulus that elicits no response
before conditioning.
Unconditioned stimulus (UCS) - a naturally occurring stimulus that leads to an
involuntary response.
Unconditioned means “unlearned” or “naturally occurring.”
Unconditioned response (UCR) - an involuntary response to a naturally occurring
or unconditioned stimulus.
Conditioned stimulus (CS) - stimulus that becomes able to produce a learned
reflex response by being paired with the original unconditioned stimulus.
A neutral stimulus can become a conditioned stimulus when paired with an
unconditioned stimulus.
Conditioned response (CR) - learned reflex response to a conditioned stimulus.
Sometimes called a conditioned reflex.
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PAVLOV’S STUDY
10
Secondary or Higher Order
Conditioning:
Could pairing light with a bell
cause the dog to salivate to
the light alone? YES
Stage 1: Unconditioned learning)
Bell = No Response
Food = Drool
Stage 2 (Acquisition)
Bell + Food = Drool
Stage 3 (Conditioned learning)
Bell = Drool
•Bell- Neutral Stimulus (NS)
•Food- Unconditioned Stimulus (UCS)
•Drool (to the food)- Unconditioned
response (UCR)
•Bell- Conditioned Stimulus (CS)
•Drool (to the bell)- Conditioned Response
(CR)
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Section 1: Test Your Knowledge
A mouse will normally flinch after getting a mild shock.
During conditioning, a red light is present right before the
mild shock is given to the mouse. Soon, the mouse will
freeze/flinch when the red light is present alone.
NS=
UCS=
UR=
CS=
CR=
Would the following process also work to condition the mouse: The mild
shock is given to the mouse before the red light is present. Why or Why
Not?
13
14. Learning Goal:
1. What is classical conditioning, and how did Pavlov’s work influence
behaviorism?
2. How does a neutral stimulus become a conditioned stimulus?
14
Rating Student Evidence
4.0
Expert
I can teach someone else about Palov’s influence
in the process of learning. In addition to 3.0 , I
can demonstrate applications and inferences
beyond what was taught
3.0
Proficient
I can analyze Palov’s influence in the process of
learning, and compare/contrast the Aspects of
the learning goal.
2.0
Developing
I can identify terms associated with Palov’s
influence in the process of learning, but need to
review this concept more.
1.0
Beginning
I don’t understand this concept and need help!
15. 2: Classical Conditioning- Part II• Learning Goals:
– Students should be able to answer the following:
1. In classical conditioning, what are the processes of acquisition, extinction,
spontaneous recovery, generalization and discrimination?
2. Do Cognitive processes and biological constraints affect classical conditioning?
15
Rating Student Evidence
4.0
Expert
I can teach someone else about the terminology associated with
classical conditioning and the biological constraints that affect the
process. In addition to 3.0 , I can demonstrate applications and
inferences beyond what was taught
3.0
Proficient
I can analyze the terminology associated with classical
conditioning and the biological constraints that affect the process,
and compare/contrast the Aspects of the learning goal.
2.0
Developing
I can identify terms associated with the terminology associated
with classical conditioning and the biological constraints that
affect the process, but need to review this concept more.
1.0
Beginning
I don’t understand this concept and need help!
17. First-Order and Second-Order Conditioning
First Order Conditioning.
•Bell + meat = salivation.
•Bell = Salivation.
Second Order Conditioning
(After first order
conditioning has occurred)
•Light + Bell = Salivation.
•Light = Salivation.
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Do cognitive processes and biological
constraints affect classical conditioning?
Cognitive Processes
•Robert Rescorla
– Sometimes called the
contingency model of classical
conditioning
– showed that animals will learn
better through classical conditioning
if the UCS reliably predicts the CS
– Point to remember: cognition also
plays a role in classical conditioning
24
Rescorla extends
Pavlov’s theory
into the cognitive
world
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Do cognitive processes and biological
constraints affect classical conditioning?
Biological Predispositions
•The Garcia Effect
– Sometimes referred to as Taste
Aversion
– Garcia showed that the duration
between the CS and the US may
be long (hours), but yet result in
conditioning.
– A biologically adaptive CS (taste)
led to conditioning and not to
others (light or sound).
– Used by ranchers in California to
prevent wolves from eating sheep
26
John Garcia
showed how
some species
may have a
biological
tendency to be
conditioned if it
aids in survival
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Section 2: Test Your Knowledge
1. An individual’s fear of dogs that is lost as the individual is exposed to dogs in a
non-threatening situation is referred to by behaviorists as a fear that has been:
A. Satiated
B. Suppressed
C. Repressed
D. Extinguished
E. Punished
2. Watson conditioned “Little Albert” to fear white rats by banging a hammer on
steel bars as the child played with the white rat. Later it was discovered that
Albert feared not only white rats, but also white stuffed animals. Albert’s fear
can be attributed to:
A.The law of effect
B.Stimulus generalization
C.Stimulus discrimination
D.An overactive imagination
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Classical Conditioning Test Your Knowledge
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For each scenario, identify the following:
UCS:
UCR:
CS:
CR:
1. Sam is 3 years old. One night his parents build a roaring fire in the
family room fireplace. The fire spits out a large ember that his his arm
and hurts a great deal. A week later when Sam’s parents clean out the
fireplace, he starts crying and runs behind the couch.
2. Melanie is driving to work on a rainy highway when she notices that
the brake lights of all the cars just ahead of her have come on. She hits
her brakes but watches in horror as her car glides into a four-car pileup.
She is shaken up by the accident. A month later, she is driving in the
rain and tenses up every time she sees brake lights.
31. Learning Goal:
1. In classical conditioning, what are the processes of acquisition, extinction,
spontaneous recovery, generalization and discrimination?
2. Do Cognitive processes and biological constraints affect classical
conditioning?
31
Rating Student Evidence
4.0
Expert
I can teach someone else about the terminology associated with
classical conditioning and the biological constraints that affect the
process. In addition to 3.0 , I can demonstrate applications and
inferences beyond what was taught
3.0
Proficient
I can analyze the terminology associated with classical
conditioning and the biological constraints that affect the process,
and compare/contrast the Aspects of the learning goal.
2.0
Developing
I can identify terms associated with the terminology associated
with classical conditioning and the biological constraints that
affect the process, but need to review this concept more.
1.0
Beginning
I don’t understand this concept and need help!
32. 3: Operant Conditioning- Part I
• Learning Goals:
– Students should be able to answer the following:
1. What is operant conditioning, and how does it differ from classical conditioning?
2. How do different schedules of reinforcement affect behavior?
32
Rating Student Evidence
4.0
Expert
I can teach someone else about the process of operant conditioning
and how reinforcement effects behavior. In addition to 3.0 , I can
demonstrate applications and inferences beyond what was taught
3.0
Proficient
I can analyze operant conditioning and how reinforcement effects
behavior, and compare/contrast the Aspects of the learning goal.
2.0
Developing
I can identify terms associated with operant conditioning and how
reinforcement effects behavior, but need to review this concept
more.
1.0
Beginning
I don’t understand this concept and need help!
33. The Law of Effect
• Edward Thorndike (1912)
• Locked cats in a cage
• Behavior changes because of its
consequences.
• Rewards strengthen behavior.
• If consequences are unpleasant, the
Stimulus-Reward connection will
weaken.
• Called the whole process
instrumental learning.
48. Token Economy
• Every time a desired
behavior is performed,
a token is given.
• They can trade tokens
in for a variety of
prizes (reinforcers)
• Used in homes, prisons,
mental institutions and
schools.
49. Premack Principle
• You have to take into
consideration the
reinforcers used.
• Is the reinforcer
wanted….or at least
is it more preferable
than the targeted
behavior.
Red Robin’s
Whiskey River
Veggie burger might
be a great positive
reinforcer for me,
but it would not
work well on a
carnivore.
50. Learning Goal:
1. What is operant conditioning, and how does it differ from classical
conditioning?
2. How do different schedules of reinforcement affect behavior?
50
Rating Student Evidence
4.0
Expert
I can teach someone else about the process of operant conditioning
and how reinforcement effects behavior. In addition to 3.0 , I can
demonstrate applications and inferences beyond what was taught
3.0
Proficient
I can analyze operant conditioning and how reinforcement effects
behavior, and compare/contrast the Aspects of the learning goal.
2.0
Developing
I can identify terms associated with operant conditioning and how
reinforcement effects behavior, but need to review this concept
more.
1.0
Beginning
I don’t understand this concept and need help!
51. 4: Operant Conditioning- Part II
• Learning Goals:
– Students should be able to answer the following:
1. How does punishment affect behavior?
51
Rating Student Evidence
4.0
Expert
I can teach someone else about how punishment
affects behavior. In addition to 3.0 , I can
demonstrate applications and inferences beyond
what was taught
3.0
Proficient
I can analyze how punishment affects behavior,
and compare/contrast the Aspects of the
learning goal.
2.0
Developing
I can identify terms associated with how
punishment affects behavior, but need to review
this concept more.
1.0
Beginning
I don’t understand this concept and need help!
52. Punishment
Meant to decrease a
behavior.
Positive Punishment
• Addition of something
unpleasant.
Negative Punishment
(Omission Training)
• Removal of something
pleasant.
Punishment works best
when it is immediately
done after behavior and
if it is harsh!
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Negative Reinforcement vs.
Punishment
• Negative Reinforcement
– Used to INCREASE a behavior in the future.
– Example: You fail your psychology test, so your parents nag you until
you study. Your parent’s goal: to get you to increase your
performance and study time.
• Punishment
– Used to DECREASE a behavior from reoccurring.
– Example: You do poorly on your psychology test, so your parents take
away your cell phone. Your parent’s goal: to stop you from doing
other things that distract you and lead to performing poorly on tests
in the future.
54
Ask Yourself:
What is the ultimate goal of the
the conditioning- To Increase
or decrease the behavior?
Ask Yourself:
What is the ultimate goal of the
the conditioning- To Increase
or decrease the behavior?
60. Learning Goal:
How does punishment affect behavior?
60
Rating Student Evidence
4.0
Expert
I can teach someone else about how punishment
affects behavior. In addition to 3.0 , I can
demonstrate applications and inferences beyond
what was taught
3.0
Proficient
I can analyze how punishment affects behavior,
and compare/contrast the Aspects of the
learning goal.
2.0
Developing
I can identify terms associated with how
punishment affects behavior, but need to review
this concept more.
1.0
Beginning
I don’t understand this concept and need help!
61. 5: Operant Conditioning- Part III (cognitive learning)
• Learning Goals:
– Students should be able to answer the following:
1. Do cognitive processes and biological constraints affect operant conditioning?
61
Rating Student Evidence
4.0
Expert
I can teach someone else about how cognitive processes and
biological constraints affect operant conditioning. In addition to 3.0 ,
I can demonstrate applications and inferences beyond what was
taught
3.0
Proficient
I can analyze how cognitive processes and biological constraints
affect operant conditioning, and compare/contrast the Aspects of
the learning goal.
2.0
Developing
I can identify terms associated with how cognitive processes and
biological constraints affect operant conditioning, but need to
review this concept more.
1.0
Beginning
I don’t understand this concept and need help!
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Biological Predispositions
• Animals will learn behaviors they are biological predisposed
to faster than behaviors that do not come naturally.
– Example: A dog will learn to fetch slippers faster than
they will learn to climb a tree.
65
Piggy Bank Experiment and “Instinctual
drift”
Pigs can learn to push things with their
snouts easily, but it takes training to get
them to learn to pick things up (like wooden
coins) in their mouth and they will
eventually revert back to pushing with their
snouts.
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Overjustification Effect
• Intrinsic Motivation: Motivated by internal drive (Doing
things because they interest you)
• Extrinsic Motivation: Motivated by outside forces (Doing
things to get a reward or avoid punishment)
• Overjustification Effect: If you are rewarded for something
you already enjoy doing, and then the reward is removed,
you will lose your intrinsic motivation.
67
How do you develop
intrinsic motivation?
Reward behaviors will
“good job” or reward
behaviors like “best effort”
or “most improved”
69. Learning Goal:?
1. Do cognitive processes and biological constraints affect operant
conditioning?
69
Rating Student Evidence
4.0
Expert
I can teach someone else about how cognitive processes and
biological constraints affect operant conditioning. In addition to 3.0 ,
I can demonstrate applications and inferences beyond what was
taught
3.0
Proficient
I can analyze how cognitive processes and biological constraints
affect operant conditioning, and compare/contrast the Aspects of
the learning goal.
2.0
Developing
I can identify terms associated with how cognitive processes and
biological constraints affect operant conditioning, but need to
review this concept more.
1.0
Beginning
I don’t understand this concept and need help!
70. 6: Learning by Observation
• Learning Goals:
– Students should be able to answer the following:
1. What is observational learning, and how is it enabled by mirror neurons?
2. What is the impact of prosocial modeling and of antisocial modeling?
70
Rating Student Evidence
4.0
Expert
I can teach someone else about how learning is enabled by
mirror neurons and the impact of prosocial and antisocial
modelIng on learning. addition to 3.0 , I can demonstrate
applications and inferences beyond what was taught
3.0
Proficient
I can analyze how learning is enabled by mirror neurons and the
impact of prosocial and antisocial modelIng on learning, and
compare/contrast the Aspects of the learning goal.
2.0
Developing
I can identify terms associated with how learning is enabled by
mirror neurons and the impact of prosocial and antisocial
modelIng on learning, but need to review this concept more.
1.0
Beginning
I don’t understand this concept and need help!
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Reel World to Real Word Violence
• More violence on TV is correlated with more
fights in school (Gentile, 2004)
• More aggressive acts are committed by those who
watch more violent TV (Eron et al, 1987)
• White South Africans were introduced to TV in
1975, since then the homicide rate has doubled
(Centerwall, 1989)
• People who view violence in TV and Video Games
tend to be more aggressive and less sympathetic.
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Review: Mini FRQ- Answers
• Extrinsic Motivation
• Rewards from outside source
• Pressure from parents or teammates
• Shaping
• Learning in stages
• First learns the grip, then the stance, then the position of the bat OR
first learns to hit off a tee, then a slow pitch, then a fast pitch
• Observational Learning
• Learns by watching others bat (mimics other’s behavior)
• Frontal Lobe
• Mirror neurons- neurons that allow her to immitate others body
position and movements
• Motor cortex will help her swing the bat by controlling body
movement.
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78. Learning Goal:
1. What is observational learning, and how is it enabled by mirror neurons?
2. What is the impact of prosocial modeling and of antisocial modeling?
78
Rating Student Evidence
4.0
Expert
I can teach someone else about how learning is enabled by
mirror neurons and the impact of prosocial and antisocial
modelIng on learning. addition to 3.0 , I can demonstrate
applications and inferences beyond what was taught
3.0
Proficient
I can analyze how learning is enabled by mirror neurons and the
impact of prosocial and antisocial modelIng on learning, and
compare/contrast the Aspects of the learning goal.
2.0
Developing
I can identify terms associated with how learning is enabled by
mirror neurons and the impact of prosocial and antisocial
modelIng on learning, but need to review this concept more.
1.0
Beginning
I don’t understand this concept and need help!
Editor's Notes
Learning is a relatively permanent change in an organism’s behavior due to experience. Nature’s most important gift to us may be our adaptability—our capacity to learn new behaviors that enable us to cope with ever-changing experiences.
Humans and other animals learn by association; our mind naturally connects events that occur in sequence. The events linked in associative learning may be two stimuli (as in classical condition- ing) or a response and its consequences (as in operant conditioning). If a stimulus occurs repeatedly, a response may diminish; in such cases, the organism habituates. In observational learning, we learn from viewing others’ experiences.
Ivan Pavlov – Russian physiologist (person who studies the workings of the body) who discovered classical conditioning through his work on digestion in dogs.
Classical conditioning - learning to make a reflex response to a stimulus other than the original, natural stimulus that normally produces the reflex.
Normally, when food is placed in the mouth of any animal, the salivary glands automatically start releasing saliva to help with chewing and digestion. This is a normal reflex (involuntary response) in both animals and humans. The food causes a particular reaction, the salivation. A stimulus can be defined as any object, event, or experience that causes a response, the reaction of an organism. In the case of Pavlov’s dogs, the food is the stimulus and salivation is the response.
Unconditioned stimulus (UCS) - a naturally occurring stimulus that leads to an involuntary response.
Unconditioned means “unlearned” or “naturally occurring.”
Unconditioned response (UCR) - an involuntary response to a naturally occurring or unconditioned stimulus.
Conditioned stimulus (CS) - stimulus that becomes able to produce a learned reflex response by being paired with the original unconditioned stimulus.
Conditioned means “learned.”
A neutral stimulus can become a conditioned stimulus when paired with an unconditioned stimulus.
Conditioned response (CR) - learned reflex response to a conditioned stimulus.
Sometimes called a conditioned reflex.
Pavlov explored the phenomenon we call classical conditioning, in which organisms learn to associate stimuli and thus anticipate events. This laid the foundation for John B. Watson’s behaviorism, which held that psychology should be an objective science that studied only observable behavior.
Pavlov would repeatedly present a neutral stimulus (such as a tone) just before an unconditioned stimulus (US), such as food, which triggered the unconditioned response (UR) of salivation. After several repetitions, the tone alone (now the conditioned stimulus [CS]) began triggering a conditioned response (CR), salivation. Unconditioned means “unlearned”; conditioned means “learned.” Thus, a UR is an event that occurs naturally in response to some stimulus. A US is something that naturally and automatically triggers the unlearned response. A CS is an originally neutral stimulus that, through learning, comes to be associated with some unlearned response. A CR is the learned response to the originally neutral but now conditioned stimulus.
Ask what involuntary responses humans have
NS-Light
UCS-shock
UR-Flinch
Higher order conditioning occurs when the conditioned stimulus from one conditioning procedure is paired with a new neutral stimulus, creating a second, often weaker, conditioned stimulus.
Extinction refers to the diminishing of a conditioned response when the conditioned stimulus occurs repeatedly without the unconditioned stimulus. The moment the CS is no longer associated with the UCS, we have EXTINCTION.
Spontaneous recovery is the reappearance, after a pause, of an extinguished conditioned response.
Extinction - the disappearance or weakening of a learned response following the removal or absence of the unconditioned stimulus (in classical conditioning) or the removal of a reinforcer (in operant conditioning).
Spontaneous recovery - the reappearance of a learned response after extinction has occurred.
Generalization is the tendency to respond to stimuli that are similar to the conditioned stimulus. Discrimination is the learned ability to distinguish between a CS and other irrelevant stimuli.
Generalization can be adaptive because it extends a learned response to other stimuli in a given category, for example, fearing not only moving cars but also moving trucks and motorcycles. Discrimination has adaptive value because it limits our learned responses to appropriate stimuli, for example, fleeing from a guard dog but not from a guide dog.
Stimulus generalization - the tendency to respond to a stimulus that is only similar to the original conditioned stimulus with the conditioned response.
Stimulus discrimination - the tendency to stop making a generalized response to a stimulus that is similar to the original conditioned stimulus because the similar stimulus is never paired with the unconditioned stimulus.
Research indicates that, for many animals, cognitive appraisals are important for learning. That is, thoughts and perceptions are important to the conditioning process. For example, animals appear capable of learning when to expect an unconditioned stimulus. The more predictable the association between the CS and the US, the stronger the CR.
For example, when repeatedly faced with traumatic events over which they have no control, people come to feel helpless, hopeless, and depressed. Psychologists call this passive resignation learned helplessness.
Show homemade Watson Clip with actual footage.
D, B
# 1 US- Burn
UR- Pain From Burn
CS- Fireplace
CR- Fear of Fire
# 2 US- Car Accident
UR- Fear, tensing after accident
CS- Brake lights in rain
CR- Tense feeling
If a response in the presence of a stimulus leads to satisfying results, then the response is strengthened.
In other words: We keep doing something we find pleasurable.
Thorndike conducted a series of famous experiments using a cat in a puzzle box. The hungry cat was locked in a cage next to a dish of food. The cat had to get out of the cage in order to get the food. Thorndike found that the amount of time required for the cat to get out of the box decreased over a series of trials. This amount of time decreased gradually; the cat did not seem to understand, suddenly, how to get out of the cage. This finding led Thorndike to assert that the cat learned the new behavior without mental activity but rather simply connected a stimulus and a response.
Thorndike put forth the law of effect that states that if the consequences of a behavior are pleasant, the stimulus-response (S-R) connection will be strengthened and the likelihood of the behavior will increase. However, if the consequences of a behavior are unpleasant, the S-R connection will weaken and the likelihood of the behavior will decrease. He used the term instrumental learning to describe his work because he believed the consequence was instrumental in shaping future behaviors.
Barrhus Francis Skinner; Show Video Clip of Skinner
The two characteristics that help us distinguish the two forms of conditioning are the following: In classical conditioning, the organism learns associations between two stimuli, and its behavior is respondent, that is, automatic. In operant conditioning, the organism learns associations between its behavior and resulting events; the organism operates on the environment.
Skinner developed a behavioral technology that revealed principles of behavior control. He explored the principles and conditions of learning through operant conditioning, in which behavior operates on the environment to produce rewarding or punishing stimuli. Skinner used an operant chamber (Skinner box) in his pioneering studies with rats and pigeons.
Chicken Training Clip; Ping Pong Clip
In his experiments, Skinner used shaping, a procedure in which reinforcers, such as food, guide an animal’s natural behavior toward a desired behavior. By rewarding responses that are ever closer to the final desired behavior (successive approximations), and ignoring all other responses, researchers can gradually shape complex behaviors. Because nonverbal animals and babies can respond only to what they perceive, their reactions demonstrate which events they can discriminate. In such experiments, the stimulus that elicits a response after association with reinforcement is referred to as the discriminative stimulus.
Chicken Training Clip; Ping Pong Clip
Chicken Training Clip; Ping Pong Clip
A reinforcer is any event that increases the frequency of a preceding response. Reinforcers can be positive (presenting a pleasant stimulus after a response) or negative (reducing or removing an unpleasant stimulus).
Two kinds of reinforcement exist. Positive reinforcement refers to the addition of something pleasant. Negative reinforcement refers to the removal of something unpleasant. For instance, if we give a rat in a Skinner box food when it presses a lever, we are using positive reinforcement. However, if we terminate a loud noise or shock in response to a press of the lever, we are using negative reinforcement.
The latter example results in escape learning. Escape learning allows one to terminate an aversive stimulus; avoidance learning, on the other hand, enables one to avoid the unpleasant stimulus altogether.
Positive Reinforcement
Giving something good to increase behavior
Examples:
Yummy Food
Smile
Good Grades, Stickers
Wanted Hugs
Negative Reinforcement
Taking away something bad to increase behavior
Examples:
Annoying seatbelt man
Stopping a nagging child/parent
Stopping a headache by taking medicine
Drug Use to relive withdrawal symptoms
Seatbelt-negative
Kiss for dishes-positive
Faking sick-negative/avoidance learning
Headache for asprin- negative
Studying for a test-positive
Breaking out of jail-negative
Positive Reinforcement
Giving something good to increase behavior
Examples:
Yummy Food
Smile
Good Grades, Stickers
Wanted Hugs
Negative Reinforcement
Taking away something bad to increase behavior
Examples:
Annoying seatbelt man
Stopping a nagging child/parent
Stopping a headache by taking medicine
Drug Use to relive withdrawal symptoms
Start With Big-Bang Clip of Operant conditioning
Primary reinforcers, such as food when we are hungry, are innately satisfying. Conditioned (secondary) reinforcers, such as cash, are satisfying because we have learned to associate them with more basic rewards. Immediate reinforcers, such as the enjoyment of watching late-night TV, offer immediate payback. Delayed reinforcers, such as a weekly paycheck, require the ability to delay gratification.
When the desired response is reinforced every time it occurs, continuous reinforcement is involved. Learning is rapid but so is extinction if rewards cease. Partial (intermittent) reinforce- ment produces slower acquisition of the target behavior than does continuous reinforcement, but the learning is more resistant to extinction. Reinforcement schedules may vary according to the number of responses rewarded or the time gap between responses.
Fixed-ratio schedules reinforce behavior after a set number of responses; variable-ratio schedules provide reinforcers after an unpredictable number of responses
Ratio (Response)
Fixed-Ratio: Every time a response occurs
People work harder
Example: typist gets paid by the number of pages typed
Variable-Ratio: Varies unpredictably
The best system for keeping behavior active
Example: Slot Machines
fixed-interval schedules reinforce the first response after a fixed time interval, and variable-interval schedules reinforce the first response after varying time intervals. Reinforcement linked to number of responses produces a higher response rate than reinforcement linked to time. Variable (unpredictable) schedules produce more consistent responding than fixed (predictable) schedules.
Interval (Time)
Fixed-Interval: is ‘x’ in length
Behavior occurs steadily over time
Test every two weeks
Variable-Interval: varies unpredictably
Behavior depends on motivation, but best over time
Waiting for a taxi cab
Skinner’s laboratory pigeons produced these response patterns to each of four reinforcement schedules. (Reinforcers are indicated by diagonal marks.) For people, as for pigeons, reinforcement linked to number of responses (a ratio schedule) produces a higher response rate than reinforcement linked to amount of time elapsed (an interval schedule). But the predictability of the reward also matters. An unpredictable (variable) schedule produces more consistent responding than does a predictable (fixed) schedule.
Schedule examples
Getting $10 for every 5 A’s you earn
Playing a slot machine
Pop quizzes
Frequent flyer programs
Picking up your paycheck
Calling in to win tickets on the radio
Hitchhiking
Speed traps
Custodian cleaning the school
Buying new shoes for every 5 pounds you lose
Studying for our tests
Watching football waiting for a
Punishment attempts to decrease the frequency of a behavior. Punishment administers an undesirable consequence, for example, spanking (positive punishment) or withdrawing something desirable, such as taking away a favorite toy (negative punishment). Unlike punishment, negative reinforcement removes an aversive event (an annoying beeping sound) to increase the frequency of a behavior (fastening a seatbelt).
Rats exploring a maze seem to develop a mental representation (a cognitive map) of the maze even in the absence of reward. Their latent learning becomes evident only when there is some incentive to demonstrate it.
Video: Rat Maze
Demonstration: go to commons area and have three students draw the room (proctors needed so no cheating occurs)
Some learning occurs after little or no systematic interaction with our environment. For example, we may puzzle over a problem, and suddenly, the pieces fall together as we perceive the solution in a sudden flash of insight.
Research indicates that people may come to see rewards, rather than intrinsic interest, as the moti- vation for performing a task. Again, this finding demonstrates the importance of cognitive process- ing in learning. By undermining intrinsic motivation—the desire to perform a behavior effectively and for its own sake—rewards can carry hidden costs. Extrinsic motivation is the desire to per- form a behavior to receive external rewards or avoid threatened punishment. A person’s interest often survives when a reward is used neither to bribe nor to coerce but to signal a job well done.
Biofeedback, a system for electronically recording, amplifying, and feeding back information regarding a subtle physiological state, has been used successfully to enable people to treat tension headaches.
Video: Chimp w/AK47, Chimp minds; Mirror Neurons
Among higher animals, especially humans, learning does not occur through direct experience alone. Observational learning also plays a part. The process of observing and imitating a specific behavior is often called modeling. Mirror neurons, located in the brain’s frontal lobes, demon- strate a neural basis for observational learning. Our brain’s mirror neurons underlie our intensely social nature.
Bandura believes that we imitate because of reinforcements and punishments—those received by the model as well as by the imitator. By watching others, we learn to anticipate a behavior’s consequences in situations like those we are observing. We tend to imitate models that we perceive as similar to us, successful, or admirable.
Video: Bobo Doll Study
Video: Bobo Doll Study
Prosocial models have prosocial effects. People who show nonviolent, helpful behavior prompt similar behavior in others. Models are most effective when their actions and words are consistent. Exposed to a hypocrite, children tend to imitate the hypocrisy by doing what the model does and saying what the model says.
Research indicates that much violence shown on television goes unpunished, is portrayed as justified, and involves an attractive perpetrator. These conditions provide a recipe for a violence- viewing effect. However, correlational studies that link viewing violence with violent behavior do not indicate the direction of influence. Those who behave violently may enjoy watching violence on TV, or some third factor may cause observers both to behave violently and to prefer watching violent programs. To establish cause and effect, researchers have designed experiments in which some participants view violence and others do not. Later, given an opportunity to express violence, the people who viewed violence tend to be more aggressive and less sympathetic. In addition to imitating what they see, observers may become desensitized to brutality, whether on TV or in real life.