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Myers’ PSYCHOLOGY Chapter 8 Learning

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Myers’ PSYCHOLOGY

Chapter 8

Learning

Learning

Learning relatively permanent change in an organism’s behavior due to experience

experience (nurture) is the key to learning

Classical Conditioning

Ivan Pavlov 1849-1936 Russian

physician/ neurophysiologist

Nobel Prize in 1904

studied digestive secretions

Pavlovian (or Classical) Conditioning

Animals (including humans) can learn to associate an arbitrary signal in the environment with some meaningful stimulus that is also present in the environment

Pavlov’s Classic Experiment

Before Conditioning

During Conditioning After Conditioning

UCS (foodin mouth)

Neutralstimulus(tone)

Nosalivation

UCR (salivation)

Neutralstimulus(tone)

UCS (foodin mouth)

UCR(salivation)

CS(tone)

CR (salivation)

Classical or Pavlovian Conditioning

Pavlov’s device for recording salivation

Classical or Pavlovian Conditioning

Classical Conditioning organism comes to associate two stimuli

lightning and thundertone and food

begins with a reflex a neutral stimulus that signals an

unconditioned stimulus begins to produce a response that anticipates and prepares for the unconditioned stimulus neutral stimulus eventually comes to evoke the reflex

Classical or Pavlovian Conditioning

Unconditioned Stimulus (UCS) effective stimulus that unconditionally-

automatically and naturally- triggers a response

Unconditioned Response (UCR) unlearned, naturally occurring automatic

response to the unconditioned stimulussalivation when food is in the mouth

Classical or Pavlovian Conditioning

Conditioned Stimulus (CS) previously neutral stimulus that, after

association with an unconditioned stimulus, comes to trigger a conditioned response

Conditioned Response (CR) learned response to a previously neutral

conditioned stimulus

Classical Conditioning Concepts

AcquisitionExtinctionSpontaneous RecoveryHigher Order ConditioningGeneralizationDiscrimination

Conditioning

Acquisition the initial stage of learning, during

which a response is established and gradually strengthened

in classical conditioning, the phase in which a stimulus comes to evoke a conditioned response

in operant conditioning, the strengthening of a reinforced response

Conditioning

Extinction diminishing of a CR in classical conditioning, when

a UCS does not follow a CS in operant conditioning, when

a response is no longer reinforced

Classical or Pavlovian Conditioning

Spontaneous Recovery reappearance, after a rest

period, of an extinguished CRGeneralization

tendency for a stimuli similar to CS to evoke similar responses

Classical or Pavlovian Conditioning

Discrimination in classical conditioning, the ability to

distinguish between a CS and other stimuli that do not signal and UCS

in operant conditioning, responding differently to stimuli that signal a behavior will be reinforced or will not be reinforced

Operant Conditioning

Operant Conditioning type of learning in which behavior is

strengthened if followed by reinforcement or diminished if followed by punishment

Law of Effect Thorndike’s principle that behaviors followed

by favorable consequences become more likely and behaviors followed by unfavorable consequences become less likely

Operant Conditioning

Operant Behavior complex or voluntary behaviors

push button, perform complex task

operates (acts) on environment produces consequences

Respondent Behavior occurs as an automatic response to

stimulus behavior learned through classical

conditioning

Operant Conditioning

B.F. Skinner (1904-1990) elaborated Thorndike’s Law of

Effect developed behavioral

technology

Operant Chamber

Skinner Box soundproof

chamber with a bar or key that an animal presses or pecks to release a food or water reward

contains a device to record responses

The classic tool: Skinner box

Operant ConditioningReinforcer

any event that strengthens the behavior it follows

Shaping conditioning procedure in which reinforcers

guide behavior toward closer approximations of a desired goal

Successive Approximations reward behaviors that increasingly resemble

desired behavior

Operant Conditioning

Principles of Reinforcement

Primary Reinforcer innately reinforcing stimulus satisfies a biological need

Secondary Reinforcer or Conditioned Reinforcer learned through association with primary

reinforcer stimulus that gains its reinforcing power

through its association with primary reinforcer

Schedules of Reinforcement

Continuous Reinforcement reinforcing the desired response each time it

occurs learning occurs rapidly extinction occurs rapidly

Partial Reinforcement reinforcing a response only part of the time results in slower acquisition greater resistance to extinction

Schedules of Reinforcement

Fixed Ratio (FR) reinforces a response only after a

specified number of responses faster you respond the more

rewards you get different ratios very high rate of responding like piecework pay

Schedules of Reinforcement

Variable Ratio (VR) reinforces a response after an

unpredictable number of responses

average ratios like gambling, fishing very hard to extinguish because of

unpredictability

Schedules of Reinforcement

Fixed Interval (FI) reinforces a response only after

a specified time has elapsed response occurs more

frequently as the anticipated time for reward draws near

Schedules of Reinforcement

Variable Interval (VI) reinforces a response at

unpredictable time intervals produces slow steady responding like pop quiz

Punishment

Punishment aversive event that

decreases the behavior that it follows

powerful controller of unwanted behavior

Problems with Punishment

Punished behavior is not forgotten, it's suppressed- behavior returns when punishment is no longer eminent

Causes increased aggression- shows that aggression is a way to cope with problems- Explains why aggressive delinquents and abusive parents come from abusive homes

Problems with Punishment

Creates fear that can generalize to desirable behaviors, e.g. fear of school, learned helplessness, depression

Does not necessarily guide toward desired behavior- reinforcement tells you what to do--punishment tells you what not to do- Combination of punishment and reward can be more effective than punishment alone

Punishment teaches how to avoid it

PunIshers

Extinction

A particular behavior is weakened by the consequence of not experiencing a positive condition or stopping a negative condition A rat presses a bar in its cage and nothing happens. Neither a positive or a negative condition exists for the

rat. The rat presses the bar again and again nothing

happens.

The rat's behavior of pressing the bar is weakened by the consequence of not experiencing anything positive or stopping anything negative.

Cognition and Operant Conditioning

Cognitive Map mental representation of the layout of

one’s environment example- after exploring a maze, rats act

as if they have learned a cognitive map of it

Latent Learning learning that occurs, but is not apparent

until there is an incentive to demonstrate it