1 psychology (8th edition) david myers powerpoint slides aneeq ahmad henderson state university...
TRANSCRIPT
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PSYCHOLOGY(8th Edition)David Myers
PowerPoint SlidesAneeq Ahmad
Henderson State University
Worth Publishers, © 2006
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Learning
Chapter 8
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Learning
How Do We Learn?
Classical Conditioning Pavlov’s Experiments
Extending Pavlov’s Understanding
Pavlov’s Legacy
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Learning
Operant Conditioning Skinner’s Experiments
Extending Skinner’s Understanding
Skinner’s Legacy
Contrasting Classical & Operant Conditioning
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Learning
Learning by Observation Bandura’s Experiments
Applications of Observational Learning
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Definition
Learning is a relatively permanent change in an organism’s behavior due to
experience.
Learning is more flexible in comparison to the genetically-programmed behaviors of
Chinooks, for example.
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How Do We Learn?
We learn by association. Our minds naturally connect events that occur in
sequence. 2000 years ago, Aristotle suggested
this law of association. Then 200 years ago Locke and Hume reiterated
this law.
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Stimulus-Stimulus Learning
Learning to associate one stimuluswith another.
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Stimulus-Stimulus Learning
Learning to associate one stimuluswith another.
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Response-Consequence Learning
Learning to associate a responsewith a consequence.
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Response-Consequence Learning
Learning to associate a responsewith a consequence.
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Ideas of classical conditioning originate from old philosophical theories. However, it was the Russian physiologist Ivan Pavlov who elucidated classical conditioning. His
work provided a basis for later behaviorists like John Watson and B. F. Skinner.
Classical Conditioning
Ivan Pavlov (1849-1936)
Sov
foto
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Pavlov’s Experiments
Before conditioning, food (Unconditioned Stimulus, US) produces salivation
(Unconditioned Response, UR). However, the tone (neutral stimulus) does not.
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Pavlov’s Experiments
During conditioning, the neutral stimulus (tone) and the US (food) are paired, resulting in
salivation (UR). After conditioning, the neutral stimulus (now Conditioned Stimulus, CS) elicits
salivation (now Conditioned Response, CR)
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Acquisition
Acquisition is the initial stage in classical conditioning in which an association between a neutral stimulus and an
unconditioned stimulus takes place.
1. In most cases, for conditioning to occur, the neutral stimulus needs to come before the unconditioned stimulus.
2. The time in between the two stimuli should be about half a second.
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Acquisition
The CS needs to come half a second before the US for acquisition to occur.
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Extinction
When the US (food) does not follow the CS (tone), CR (salivation) begins to
decrease and eventually causes extinction.
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Spontaneous Recovery
After a rest period, an extinguished CR (salivation) spontaneously recovers, but if the CS
(tone) persists alone, the CR becomes extinct again.
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Stimulus Generalization
Tendency to respond to stimuli similar to the CS is called generalization. Pavlov conditioned the dog’s salivation (CR) by
using miniature vibrators (CS) on the thigh. When
he subsequently stimulated other parts of the dog’s body, salivation
dropped.
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Stimulus Discrimination
Discrimination is the learned ability to distinguish between a conditioned stimulus and other stimuli that do not signal an unconditioned
stimulus.
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Extending Pavlov’s Understanding
Pavlov and Watson considered consciousness, or mind, unfit for the
scientific study of psychology. However, they underestimated the importance of
cognitive processes and biological constraints.
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Cognitive Processes
Early behaviorists believed that learned behaviors of various animals could be
reduced to mindless mechanisms.
However, later behaviorists suggested that animals learn the predictability of a
stimulus, meaning they learn expectancy or awareness of a stimulus (Rescorla, 1988).
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Biological Predispositions
Pavlov and Watson believed that laws of learning were similar for all animals.
Therefore, a pigeon and a person do not differ in their learning.
However, behaviorists later suggested that learning is constrained by an
animal’s biology.
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Biological Predispositions
John Garcia
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).
Courtesy of John G
arcia
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Biological Predispositions
Even humans can develop classically to conditioned nausea.
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Pavlov’s greatest contribution to psychology
is isolating elementary behaviors from more
complex ones through objective scientific
procedures.
Pavlov’s Legacy
Ivan Pavlov(1849-1936)
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Watson used classical conditioning procedures to develop advertising
campaigns for a number of organizations,
including Maxwell House, making the “coffee break”
an American custom.
Applications of Classical Conditioning
John B. Watson
Brow
n Brothers
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1. Alcoholics may be conditioned (aversively) by reversing their positive-associations with alcohol.
2. Through classical conditioning, a drug (plus its taste) that affects the immune response may cause the taste of the drug to invoke the immune response.
Applications of Classical Conditioning
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Operant & Classical Conditioning
1. Classical conditioning forms associations between stimuli (CS and US). Operant conditioning, on the other hand, forms an association between behaviors and the resulting events.
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Operant & Classical Conditioning
2. Classical conditioning involves respondent behavior that occurs as an automatic response to a certain stimulus. Operant conditioning involves operant behavior, a behavior that operates on the environment, producing rewarding or punishing stimuli.
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Skinner’s ExperimentsSkinner’s experiments extend Thorndike’s
thinking, especially his law of effect. This law states that rewarded behavior is likely to
occur again.
Yale U
niversity Library
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Operant Chamber
Using Thorndike's law of effect as a starting point, Skinner developed the
Operant chamber, or the Skinner box, to study operant conditioning.
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Operant Chamber
The operant chamber, or Skinner box, comes with a bar or key that
an animal manipulates to obtain a reinforcer like food or water. The bar or key is connected to devices that record
the animal’s response.
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Shaping
Shaping is the operant conditioning procedure in which reinforcers guide behavior towards
the desired target behavior through successive approximations.
A rat shaped to sniff mines. A manatee shaped to discriminateobjects of different shapes, colors and sizes.
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Fred Bavendam
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Types of Reinforcers
Any event that strengthens the behavior it follows. A heat lamp positively reinforces a
meerkat’s behavior in the cold.
Reuters/ C
orbis
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1. Primary Reinforcer: An innately reinforcing stimulus like food or drink.
2. Conditioned Reinforcer: A learned reinforcer that gets its reinforcing power through association with the primary reinforcer.
Primary & Secondary Reinforcers
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1. Immediate Reinforcer: A reinforcer that occurs instantly after a behavior. A rat gets a food pellet for a bar press.
2. Delayed Reinforcer: A reinforcer that is delayed in time for a certain behavior. A paycheck that comes at the end of a week.
Immediate & Delayed Reinforcers
We may be inclined to engage in small immediate reinforcers (watching TV) rather than large
delayed reinforcers (getting an A in a course) which require consistent study.
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Reinforcement Schedules
1. Continuous Reinforcement: Reinforces the desired response each time it occurs.
2. Partial Reinforcement: Reinforces a response only part of the time. Though this results in slower acquisition in the beginning, it shows greater resistance to extinction later on.
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Ratio Schedules
1. Fixed-ratio schedule: Reinforces a response only after a specified number of responses. e.g., piecework pay.
2. Variable-ratio schedule: Reinforces a response after an unpredictable number of responses. This is hard to extinguish because of the unpredictability. (e.g., behaviors like gambling, fishing.)
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Interval Schedules
1. Fixed-interval schedule: Reinforces a response only after a specified time has elapsed. (e.g., preparing for an exam only when the exam draws close.)
2. Variable-interval schedule: Reinforces a response at unpredictable time intervals, which produces slow, steady responses. (e.g., pop quiz.)
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Schedules of Reinforcement
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Punishment
An aversive event that decreases the behavior it follows.
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Punishment
1. Results in unwanted fears.2. Conveys no information to the organism.3. Justifies pain to others.4. Causes unwanted behaviors to reappear
in its absence.5. Causes aggression towards the agent.6. Causes one unwanted behavior to appear
in place of another.
Although there may be some justification for occasional punishment (Larzelaere & Baumrind,
2002), it usually leads to negative effects.
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Extending Skinner’s Understanding
Skinner believed in inner thought processes and biological underpinnings, but many psychologists criticize him for
discounting them.
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Cognition & Operant Conditioning
Evidence of cognitive processes during operant learning comes from rats during
a maze exploration in which they navigate the maze without an obvious
reward. Rats seem to develop cognitive maps, or mental representations, of the
layout of the maze (environment).
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Latent Learning
Such cognitive maps are based on latent learning, which becomes apparent when an incentive is given (Tolman & Honzik, 1930).
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Motivation
Intrinsic Motivation: The desire to perform a behavior for its own sake.
Extrinsic Motivation: The desire to perform a behavior due to promised rewards or threats of punishments.
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Biological Predisposition
Biological constraints predispose organisms to learn associations
that are naturally adaptive.
Breland and Breland (1961) showed that
animals drift towards their biologically
predisposed instinctive behaviors. Marian Breland Bailey
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Skinner’s Legacy
Skinner argued that behaviors were shaped by external influences instead of inner thoughts and
feelings. Critics argued that Skinner dehumanized people by neglecting their free will.
Falk/ Photo Researchers, Inc.
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Applications of Operant Conditioning
Skinner introduced the concept of teaching machines that shape learning in small steps and provide reinforcements
for correct rewards.
In School
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Applications of Operant Conditioning
Reinforcement principles can enhance athletic performance.
In Sports
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Applications of Operant Conditioning
Reinforcers affect productivity. Many companies now allow employees to share
profits and participate in company ownership.
At work
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Applications of Operant Conditioning
In children, reinforcing good behavior increases the occurrence of these behaviors. Ignoring
unwanted behavior decreases their occurrence.
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Operant vs. Classical Conditioning
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Learning by Observation
Higher animals, especially humans,
learn through observing and
imitating others.
The monkey on the right imitates the
monkey on the left in touching the pictures in a certain order to
obtain a reward.
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Learning by Observation
• Observational Learning– learning by observing and imitating others
• Modeling– process of observing and imitating behavior
• Prosocial Behavior– positive, constructive, helpful behavior– opposite of antisocial behavior
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Mirror Neurons
Neuroscientists discovered mirror neurons in the brains of animals and humans that are active during observational learning.
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Imitation Onset
Learning by observation begins early in life. This
14-month-old child imitates the adult on TV
in pulling a toy apart.
Mel
tzof
f, A
.N. (
1998
). I
mita
tion
of te
levi
sed
mod
els
by in
fant
s. C
hild
Dev
elop
men
t, 59
122
1-12
29. P
hoto
s C
ourt
esy
of A
.N. M
eltz
off
and
M. H
anuk
.
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59
Bandura's Experiments
Bandura's Bobo doll study (1961)
indicated that individuals
(children) learn through imitating
others who receive rewards and punishments.
Cou
rtes
y of
Alb
ert B
andu
ra, S
tanf
ord
Uni
vers
ity
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60
Applications of Observational Learning
Unfortunately, Bandura’s studies
show that antisocial models (family,
neighborhood or TV) may have
antisocial effects.
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61
Positive Observational Learning
Fortunately, prosocial (positive, helpful) models may have prosocial effects.
Bob
Dae
mm
rich
/ The
Im
age
Wor
ks
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62
Television and Observational Learning
Gentile et al., (2004) shows that children
in elementary school who are
exposed to violent television, videos, and video games express increased
aggression.
Ron
Cha
pple
/ Tax
i/ G
etty
Im
ages
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63
Modeling Violence
Research shows that viewing media violence leads to an increased expression of aggression.
Children modeling after pro wrestlers
Bob
Dae
mm
rich
/ The
Im
age
Wor
ks
Gla
ssm
an/ T
he I
mag
e W
orks
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64
Chimp and Tiger Cubs
• http://www.cnn.com/video/#/video/living/2008/11/11/ramos.fl.chimp.tiger.cubs.wsvn