learning2004

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Published on November 16, 2007

Author: Elena

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Learning:  Learning Thoughts on Learning:  Thoughts on Learning “Learning is not compulsory. Neither is survival.” W. Edwards Demming “Education is what survives when what has been learned has been forgotten.” B.F. Skinner “I am always doing that which I cannot do, in order that I may learn how to do it.” Pablo Picasso What is Learning?:  What is Learning? A relatively permanent change in behavior that results from experience Types of Learning:  Types of Learning Classical conditioning Operant conditioning Cognitive and social learning Classical Conditioning: Examples:  Classical Conditioning: Examples Sound of a dentist’s drill: sweaty palms Smell of mom’s perfume: smiling Sight of certain restaurant: nausea Noise of a can opener: cat comes running Smell of a hospital: weakened immunity How does this happen? Classical Conditioning:  Classical Conditioning Discovered (accidentally) by Ivan Pavlov Components Unconditioned Stimulus (US) Unconditioned Response (UR) Conditioned Stimulus (CS) Conditioned Response (CR) Pavlov’s Observation:  Pavlov’s Observation Studied digestion in dogs Presented meat powder and measured salivation Dogs started salivating before food was presented Why? Pavlov’s Experiment: Phase 1:  Pavlov’s Experiment: Phase 1 Food (US): salivation (UR) Reflexive response Tone (CS): nothing (CR) Pavlov’s Experiment: Phase 2:  Pavlov’s Experiment: Phase 2 CS is repeatedly paired with the US A tone is sounded before the food is presented Pavlov’s Experiment: Phase 3:  Pavlov’s Experiment: Phase 3 Eventually, the CS elicits a new CR Hearing the tone by itself causes salivation Classical Conditioning: Conditioned Emotional Response:  Classical Conditioning: Conditioned Emotional Response Avoidance learning Conditioned phobias Little Albert Biological preparedness Contrapreparedness Easy to develop a snake phobia Hard to develop a car door phobia Classical Conditioning:  Classical Conditioning Extinction Spontaneous recovery Classical Conditioning:  Classical Conditioning Stimulus generalization Stimulus discrimination Classical Conditioning:  Classical Conditioning Stimulus generalization is the extension of a conditioned response from the training stimulus to similar stimuli. Through conditioning Baby Hannah smiles and laughs at the title screen with dark background and white writing that precedes a funny song and cartoon on her “Merrytubbies” video tape. Her parents notice that she also smiles and giggles at the FBI Warning screen appearing on movie videotapes. Slide15:  Stimulus generalization is the process of extending a learned response to new stimuli that resemble the one used in training. Similar stimuli similar elicit a stronger response. Classical Conditioning:  Classical Conditioning Discrimination is the process of learning to respond differently to two stimuli because they produce two different outcomes. Gradually Hannah stops laughing at the FBI Warning screen because the song and cartoon do not follow it. Higher Order Conditioning:  Higher Order Conditioning Pair CS1 with a new CS2 CS2: CR But, CR will be weaker The General Rule of Conditioning:  The General Rule of Conditioning Previously neutral stimulus will lead to a conditioned response (CR) whenever it provides the organism with information about the upcoming occurrence of the unconditioned stimulus (UCS). (Rescorla, 1992; Rescorla & Wagner, 1972). As with Pavlov’s dogs, the sound of the metronome just before presentation of food (UCS) became a conditioned stimulus (CS) because the dogs began salivating (CR) when the metronome ticked. Conditioning occurs because the sound of the metronome provides the dog with information that food will soon be delivered. Classical Conditioning Applied:  Classical Conditioning Applied Drug overdoses Smoking: environmental cues Systematic desensitization Advertising: sex appeal Taste aversion Conditioning and the immune system Types of Learning:  Types of Learning Classical Conditioning Operant Conditioning Cognitive and Social Learning Operant Conditioning:  Operant Conditioning Classical conditioning teaches about future events, but it seldom allows one to change those events. Thorndike proposed that behavior became more or less likely based on whether it produced a desired or undesired consequence, something he called the “law of effect”. B.F. Skinner later called this idea “operant conditioning” because an organism’s behavior is operating on the environment to achieve some desired goal. This is a more active form of learning than that of classical conditioning. Operant Conditioning: Examples:  Operant Conditioning: Examples Tantrums are punished: fewer tantrums Tantrums bring attention: more tantrums Slot machine pays out: gamble more Reward dog for sitting: dog is likely to sit How does this happen? Fuzzy Knows!! Operant Conditioning:  Operant Conditioning Thorndike’s puzzle box Law of Effect: actions that have positive outcomes are likely repeated Skinner box Thorndike The Law of Effect:  Thorndike The Law of Effect Skinner and Operant Learning:  Skinner and Operant Learning Voluntary and goal directed Controlled by its consequences Strengthened if rewarded or weakened if punished Skinner defined operant learning as: The mouse is “operating” on its environment by pressing the food lever in the Skinner box and receiving a food reward. Operant Conditioning: Principles:  Operant Conditioning: Principles Stimulus-Response Reinforcement Positive reinforcement Negative reinforcement Punishment Positive punishment Negative punishment Principles of operant conditioning:  Principles of operant conditioning Relies on principle of reinforcement, in which the consequences of a behavior lead to a higher frequency of the behavior occurring later on. Reinforcement works best when it involves a response contingency. There are different types of reinforcers: Positive reinforcement is when a desired reinforcer is presented after the occurrence of the desired behavior. Negative reinforcement is when an unpleasant event or circumstance is removed after the occurrence of the desired behavior. Principles of operant conditioning:  Principles of operant conditioning Punishment is typically the occurrence of an unpleasant event as a consequence of a response, always decreasing the likelihood of the recurrence of that response. Punishment is most effective if it has three characteristics: It should occur immediately after the undesired behavior. It must be consistent. It must be aversive without being abusive Effective Punishment:  Effective Punishment Should be Swift Consistent Appropriately aversive Challenges Physical punishment may be imitated May fear the person who punishes Most effective when paired with reinforcers Principles of operant conditioning:  Principles of operant conditioning Dangers of using punishment It does not eliminate the capacity to engage in the problem behavior. Physical punishment may elicit increased aggressive behavior in the person being punished. Through classical conditioning, the person being punished may learn to fear the punisher. Typically requires continuous observation. Shaping Behavior:  Shaping Behavior Shaping, or the method of successive approximations, is the process of teaching a new behavior by reinforcing closer and closer approximations to the desired behavior. Behavior is shaped by breaking down a desired behavior into smaller substeps (or approximations) then successively reinforcing each substep until the desired behavior is reached. Building Complex Behaviors:  Building Complex Behaviors Shaping Gradual reinforcement of successive approximations of target behavior Used to train animals to do complex tricks Reinforcement:  Reinforcement Reinforcement increases the probability of the behavior it follows. Continuous reinforcement (rewarding every correct response) results in fast learning, but can be quickly extinguished. Partial reinforcement keeps us responding vigorously for longer. Variable ratio reinforcement leads to the highest rates of responding greatest resistance to extinction. Reinforcement Schedules:  Reinforcement Schedules Contiuous reinforcement Partial reinforcement Fixed interval Variable interval Fixed ratio Variable ratio Reinforcement Schedules:  Reinforcement Schedules Reinforcement:  Reinforcement Primary reinforcers Secondary reinforcers Behavior modification Immediate versus delayed reinforcement Beyond Basic Reinforcement:  Beyond Basic Reinforcement Generalization Discrimination Discriminative stimulus Extinction Spontaneous recovery Classical versus Operant Conditioning:  Classical versus Operant Conditioning Classical conditioning Learned association between US and CS Organism is passive Responses elicited Operant conditioning Associate response and reinforcement Organism is active Responses emitted Shared features Avoidance learning Extinction and spontaneous recovery Generalization and discrimination Types of Learning:  Types of Learning Classical conditioning Operant conditioning Cognitive and social learning Cognitive Learning:  Cognitive Learning Latent learning Tolman’s rats: cognitive maps Cognitive Learning:  Cognitive Learning Insight learning “Aha” experience Observational Learning :  Observational Learning Imitation or Modeling Observational Learning :  Observational Learning Observational learning is learning a behavior by observing or imitating the behavior of others (models). Behavior that has been rewarded is most likely to be imitated. During observational learning, one learns by watching how others behavior is reinforced or punished, not one’s own behavior. Operant learning, on the other hand, is learning directly from one’s own experience. Bandura’s Social Learning Theory:  Bandura’s Social Learning Theory People learn social behaviors mainly through observation and cognitive processing of information, rather than through direct experience. Observational learning is the central tenet to this theory. For observational learning to occur, one must Pay attention to a model’s behavior Remember what has been observed Be able to perform the observed behavior Be motivated to perform the observed behavior Aggressive Behavior:  Aggressive Behavior Studies suggest that children learn aggressive behaviors through observation. Punishment does not seem to prevent the learning of aggression, but it does seem to inhibit its expression. Nonaggressive responding can also be learned through positive social modeling. Observational Learning:  Observational Learning Bandura’s Bobo doll study

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