myers’ psychology chapter 8 learning z learning yrelatively permanent change in an organism’s...
TRANSCRIPT
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
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
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
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
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