Download File - Psychology 40S with Susan Lawrie, M.Ed.

Module 10
Operant & Cognitive Approaches
OPERANT CONDITIONING
• Operant Conditioning
– also called instrumental conditioning
– kind of learning in which an animal or human
performs some behavior
– following consequence (reward or punishment)
increase or decrease the chance that an animal or
human will again perform that same behavior
OPERANT CONDITIONING (CONT.)
• Thorndike’s law of effect
– states that behaviors followed by positive
consequences are strengthened, while behaviors
followed by negative consequences are weakened
• Skinner’s operant conditioning
– focuses on how consequences (rewards or
punishments) affect behaviors
– 1920’s and 1930’s gave learning a mighty jolt with the
discovery of two general principles
– Pavlov’s classical conditioning
– Skinner’s operant conditioning
OPERANT CONDITIONING (CONT.)
OPERANT CONDITIONING (CONT.)
OPERANT CONDITIONING (CONT.)
• Principles and procedures
– Skinner box
– automated to record the animal’s bar presses and
deliver food pellets
– Skinner box is an efficient way to study how an
animal’s ongoing behaviors may be modified by
changing the consequences of what happens after a
bar press
– 3 factors in operant conditioning of a rat
– a hungry rat will be more willing to eat the food
reward
– operant response: condition the rat to press the bar
– shaping: procedure in which an experimenter
successively reinforces behaviors that lead up to or
approximate the desired behavior
OPERANT CONDITIONING (CONT.)
OPERANT CONDITIONING (CONT.)
• Shaping
– Facing the bar
• rat is put in box
• when rat finally faces the bar, food pellet is
released
• rat sniffs the food pellet
– Touching the bar
• rat faces and moves towards the bar
• another pellet is released
• rat eats then wanders. Returning to sniff for a
pellet, another pellet is dropped into the cup. Rat
places a paw on the bar and another pellet is
released.
OPERANT CONDITIONING (CONT.)
• Shaping
– Pressing the bar
• When rat touches bar pellet is released. Rat eats
and then puts paws back on bar and gets another
pellet. Wait for rat to now push bar then release
pellet.
• Rat soon presses bar over and over again to get
pellets.
• Rat’s behavior was reinforced as the rat leads up
to, or approximates, the desired behavior of bar
pressing
OPERANT CONDITIONING (CONT.)
• Immediate reinforcement
– reinforcer should follow immediately after the desired
behavior
– if reinforcer is delayed, the animal may be reinforced
for some undesired or superstitious behavior
• Superstitious behavior
– behavior that increases in frequency because its
occurrence is accidentally paired with the delivery of a
reinforcer
OPERANT CONDITIONING (CONT.)
• Examples of operant conditioning
– Toilet training
• target behavior
• preparation
• reinforcers
• shaping
– Food refusal
• target behavior
• preparation
• reinforcers
• shaping
OPERANT CONDITIONING (CONT.)
• Operant versus classical conditioning
– Operant conditioning
• goal: increase or decrease the rate of some
response
• voluntary response: must perform voluntary
response before getting a reward
• emitted response: animals or humans are shaped
to emit the desired responses
OPERANT CONDITIONING (CONT.)
• Operant versus classical conditioning
– Operant conditioning
• contingent on behavior: depends or is contingent
on the consequences or what happens next
• reinforcer must occur immediately after the desired
response
• consequences: animals or humans learn that
performing or emitting some behavior is followed
by a consequence (reward or punishment)
OPERANT CONDITIONING (CONT.)
• Operant versus classical conditioning
– Classical conditioning
• goal: create a new response to a neutral stimulus
• involuntary response: physiological reflexes
(salivation, eye blink)
– triggered or elicited by some stimulus and
called involuntary responses
• elicited response: unconditioned stimulus triggers
or elicits an involuntary reflex response, salivation,
which is called the unconditioned response
OPERANT CONDITIONING (CONT.)
• Operant versus classical conditioning
– Classical conditioning
• conditioned response: neutral stimulus becomes
the conditioned stimulus when alone before the
occurrence of the conditioned response
• expectancy: animals and humans learn a
predictable relationship between, or develop an
expectancy about, the neutral and unconditioned
stimuli
– classical conditioning leads to the animal or
human learning a predictable relationship
between stimuli
REINFORCERS
• Consequences
– consequences are contingent on behavior
• Reinforcement
– consequence that occurs after a behavior and
increases the chance that the behavior will occur
again
• Punishment
– consequence that occurs after a behavior and
decreases the chance that the behavior will occur
again
REINFORCERS (CONT.)
• Reinforcement
– Positive reinforcement
• refers to the presentation of a stimulus that
increases the probability that a behavior will occur
again
• positive reinforcer is a stimulus that increases the
likelihood that a response will occur again
– Negative reinforcement
• refers to an aversive stimulus whose removal
increases the likelihood that the preceding
response will occur again
REINFORCERS (CONT.)
• Reinforcers
– Primary reinforcers
• stimulus such as food, water, or sex, that is
innately satisfying and requires no learning on the
part of the subject to become pleasurable
– Secondary reinforcers
• any stimulus that has acquired its reinforcing
power through experience; secondary reinforcers
are learned, such as by being paired with primary
reinforcers or other secondary reinforcers
REINFORCERS (CONT.)
• Punishment
– Positive punishment
• refers to presenting an aversive (unpleasant)
stimulus after a response
– Negative punishment
• refers to removing a reinforcing stimulus after a
response
– Self-injurious behavior
• refers to serious and sometimes life-threatening
physical damage that a person inflicts on his or her
own body
• includes, body or head banging, biting, kicking,
poking ears or eyes, pulling hair, or intense
scratching
SCHEDULES OF REINFORCEMENT
• Skinner’s contributions
– Schedule of reinforcement
• refers to a program or rule that determines how
and when the occurrence of a response will be
followed by a reinforcer
– Continuous reinforcement
• every occurrence of the operant response results
in delivery of the reinforcer
– Partial reinforcement
• refers to a situation in which responding is
reinforced only some of the time
SCHEDULES OF REINFORCEMENT (CONT.)
• Partial reinforcement schedules
– Fixed-ratio schedule
• a reinforcer occurs only after a fixed number of
responses are made by the subject
– Fixed-interval schedule
• a reinforcer occurs following the first response that
occurs after a fixed interval of time
SCHEDULES OF REINFORCEMENT (CONT.)
• Partial reinforcement schedules
– Variable-ratio schedule
• a reinforcer is delivered after an average number
of correct responses has occurred
– Variable-interval schedule
• reinforcer occurs following the first correct
response after an average amount of time has
passed
OTHER CONDITIONING CONCEPTS
• Generalization
– an animal or a person emits the same response to
similar stimuli
– tendency for a stimulus similar to the original
conditioned stimulus to elicit a response similar to the
conditioned response
• Discrimination
– occurs during classical conditioning when an
organism learns to make a particular response to
some stimuli but not to others
OTHER CONDITIONING CONCEPTS (CONT.)
• Extinction and spontaneous recovery
– Extinction
• refers to a procedure in which a conditioned
stimulus is repeatedly presented without the
unconditioned stimulus
• the conditioned stimulus tends to no longer elicit
the conditioned response
– Spontaneous recovery
• tendency for the conditioned response to reappear
after being extinguished
• even though there have been no further
conditioning trials
COGNITIVE LEARNING
• Three viewpoints of cognitive learning
– against: B. F. Skinner
– Skinner said, “As far as I’m concerned, cognitive
science is the creationism (downfall) of psychology”.
– in favor: Edward Tolman
– explored hidden mental processes
– cognitive map
– a mental representation in the brain of the layout of
an environment and its features
COGNITIVE LEARNING (CONT.)
• Three viewpoints of cognitive learning
– in favor: Albert Bandura
– Bandura
• focused on how humans learn through observing
things
• Social cognitive learning
– results from watching, and modeling and does not
require the observer to perform any observable
behavior or receive any observable reward
COGNITIVE LEARNING (CONT.)
• Bandura’s social cognitive theory
– emphasizes the importance of observation, imitation,
and self-reward in the development and learning of
social skills, personal interactions, and many other
behaviors
• Four processes
– Attention
• observer must pay attention to what the model
says or does
– Memory
• observer must store or remember the information
so that it can be retrieved and used later
COGNITIVE LEARNING (CONT.)
• Bandura’s social cognitive theory
• Four processes (cont.)
– Imitation
• observer must be able to use the remembered
information to guide his or her own actions and
thus imitate the model’s behavior
– Motivation
• observer must have some reason or incentive to
imitate the model’s behavior
COGNITIVE LEARNING (CONT.)
• Insight learning
– Insight
• a mental process marked by the sudden and
unexpected solution to a problem: a phenomenon
often called the “ah-ha!” experience.
BIOLOGICAL FACTORS
• Definition
– Biological factors
• refer to innate tendencies or predispositions that
may either facilitate or inhibit certain kinds of
learning
– Imprinting
• refers to inherited tendencies or responses that are
displayed by newborn animals when they
encounter certain stimuli in their environment
– Critical or sensitive period
• a relatively brief time during which learning is most
likely to occur