chapter 5 ppp
DESCRIPTION
TRANSCRIPT
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Learning
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Adaptation to the Environment
• Learning—a process that produces a relatively enduring change in behavior or knowledge due to past experience
• Conditioning--the process of learning associations between environmental events and behavioral responses
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Learning Processes
• Classical conditioning
• Operant conditioning
• Observational learning
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Ivan Pavlov (1849–1936)
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Pavlov’s Dogs
• Digestive reflexes and salivation
• Psychic secretion
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Classical Conditioning
UNCONDITIONED STIMULUS REFLEX ACTIONwill
elicit a
UNCONDITIONED STIMULUS
NEUTRAL STIMULUSREFLEX ACTIONwill
elicit a
CONDITIONED STIMULUSCONDITIONED STIMULUSwill
elicit aCONDITIONED
RESPONSE
NEUTRAL STIMULUSwill
elicit NO REACTION
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Neutral Stimulus—Bell
• Does not normally elicit a response or reflex action by itself– a bell ringing
– a color
– a furry object
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Unconditioned Stimulus—Food
• Always elicits a reflex action: an unconditioned response– food
– blast of air
– noise
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Unconditioned Response—Salivation
• A response to an unconditioned stimulus—naturally occurring– Salivation at smell of food
– Eye blinks at blast of air
– Startle reaction in babies
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Conditioned Stimulus—Bell
• The stimulus that was originally neutral becomes conditioned after it has been paired with the unconditioned stimulus
• Will eventually elicit the unconditioned response by itself
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Conditioned Response
• The original unconditioned response becomes conditioned after it has been elicited by the neutral stimulus
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Classical Conditioning Factors
• Stimulus generalization
• Stimulus discrimination
• Extinction
• Spontaneous recovery
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Behaviorism
• The attempt to understand observable activity in terms of observable stimuli and observable responses
• John B. Watson (1913)• B. F. Skinner (1938)
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John B. Watson and Little Albert
• Conditioned emotional responses
• Generalization
• Extinction
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Classical Conditioning and Drug Use
• Regular use may produce “placebo response” where user associates sight, smell, taste with drug effect
• Classically conditioned responses may be one explanation for the characteristics of withdrawal and tolerance
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Cognitive Aspects of Classical Conditioning
• Reliable and unreliable signals
• Actively process information
• Robert Rescorla
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Evolutionary Perspective
• Conditioned taste aversions
• Internal stimuli—associate better with taste
• External stimuli—associate better with pain
• Biological preparedness
• John Garcia—not all neutral stimuli can become conditioned stimuli
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Early Operant Conditioning
• E. L. Thorndike (1898)
• Puzzle boxes and catsScratch at bars
Push at ceiling
Dig at floorSituation:stimuliinside ofpuzzle box
Howl
Etc.
Etc.
Press lever
First Trialin Box
Scratch at bars
Push at ceiling
Dig at floorSituation:stimuliinside ofpuzzle box
Howl
Etc.
Etc.
Press lever
After ManyTrials in Box
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Edward L. Thorndike ( 1874–1949)
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B. F. Skinner (1904–1990)
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B. F. Skinner’s Operant Conditioning
• Did not like Thorndike’s term “satisfying state of affairs”
• Interested in emitted behaviors
• Operant—voluntary response that acts on the environment to produce consequences
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Reinforcement—the occurrence of a stimulus following a response that increases the likelihood of the response being repeated
Operant Conditioning
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Reinforcers
• Primary—a stimulus that is inherently reinforcing for a species (biological necessities)
• Conditioned—a stimulus that has acquired reinforcing value by being associated with a primary reinforcer
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Punishment
Presentation of a stimulus following a behavior that acts to decrease the likelihood that the behavior will be repeated
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Problems with Punishment
• Does not teach or promote alternative, acceptable behavior
• May produce undesirable results such as hostility, passivity, fear
• Likely to be temporary
• May model aggression
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Operant Conditioning Terms
• Shaping
• Extinction
• Spontaneous Recovery
• Discriminative Stimulus
• Schedules of Reinforcement
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Discriminative Stimuli
Environmental cues that tell us when a particular response is likely to be reinforced
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Reinforcement Schedules
• Continuous—every correct response is reinforced; good way to get a low frequency behavior to occur
• Partial—only some correct responses are reinforced; good way to make a behavior resistant to extinction
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Partial Schedules—Ratio• Ratio schedules are based on number of
responses emitted• Fixed ratio (FR)—a reinforcer is delivered
after a certain (fixed) number of correct responses
• Variable ratio (VR)—a reinforcer is delivered after an average number of responses, but varies from trial to trial
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Ratio Responses
• FR—highest level of responding
• VR—high rate with few breaks
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Partial Schedules—Interval
• Interval schedules are based on time• Fixed interval (FI)—reinforcer is delivered
for the first response after a fixed period of time has elapsed
• Variable interval (VI)—reinforcer is delivered for the first response after an average time has elapsed, differs between trials
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Interval Responses
• FI—steady schedule with “scalloped” look, responses drop off right after reinforcer
• VI—steady, consistent schedule of response
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Contemporary Views of Operant Conditioning
• Cognitive map—term for a mental representation of the layout of a familiar environment
• Latent learning—learning that occurs in the absence of reinforcement, but is not demonstrated until a reinforcer is available
• Learned helplessness—phenomenon where exposure to inescapable and uncontrollable aversive events produces passive behavior
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Biological Predispositions
• Animal training issues
• Instinctive drift—naturally occurring behaviors that interfere with operant responses
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Classical Conditioning vs. Operant Conditioning
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Observation Learning
• Observation
• Modeling
• Imitation
• Albert Bandura and the BoBo doll study
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Do what I say, not what I do—
This will teach you to hit your brother—
Why do you do that, you know you get in trouble for it—
Famous last words???