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Learning perspectives:Lecture #3 topics
start keeping a dream diary!
classical conditioning (Pavlov) conditioned emotional responses
operant conditioning (Skinner) schedules of reinforcement superstitious behaviours
observational learning (Bandura) the Bobo doll experiment (1965)
Learning perspectives
personality:
consists of all the associations we have learned over life emphasis on external, not internal, factors emphasis on situational specificity
Classical conditioning
Ivan Pavlov(1849 – 1936)
Classical conditioning
Classical conditioning
stage 1:
unconditioned stimulus (US) unconditioned response (UR)
→
→
→
URUS
Classical conditioning
stage 2:
conditioned stimulus (CS) + unconditioned stimulus (US)
(US) food salivation (UR)
Classical conditioning
stage 3:
conditioned stimulus (CS) conditioned response (CR)
(US) food salivation (UR)bell + food
Classical conditioning
stage 4:
present conditioned stimulus (CS) alone
Classical conditioning
higher-order conditioning:
conditioned stimulus (CS) conditioned response (CR)unconditioned stimulus (US) unconditioned response (UR)
(US) food salivation (UR)bell + food
(CS) bell salivation (CR)
Classical conditioning
generalization gradient:
05
1015202530354045
400 800 1200 1600 2000
test stimuli (Hz)
sali
vati
on
(m
l)
Classical conditioning
1500 Hz tonetrial 6:
1200 Hz tone + foodtrial 5:
1500 Hz tonetrial 4:
1200 Hz tone + foodtrial 3:
1500 Hz tonetrial 2:
1200 Hz tone + foodtrial 1:
Classical conditioning
salivationtonetrial 6:
salivationtonetrial 5:
salivationtonetrial 4:
salivationtone + foodtrial 3:
salivationtone + foodtrial 2:
salivationtone + foodtrial 1:
Classical conditioning
John B. Watson(1878 – 1958)
Watson & Raynor
Classical conditioning
emotional conditioning:
classical conditioning where the CRs are emotional reactions
preferences reflect learned associations between neutral stimuli and good/ bad feelings
e.g., business lunches & break-ups
Classical conditioning
(US) ex-bf -ve feelings (UR) “Berger” + ex-bf
(CS) “Berger” -ve feelings (CR)
“Berger”
Classical conditioning
phobias:
unrealistic fears of something, ranging from mild to severe e.g., girl with a pickle phobia
treatment includes:
Classical conditioning
systematic desensitization:
involves counterconditioning responses that are incompatible with anxiety (e.g., deep muscle relaxation)
steps:
Operant conditioning
B.F. Skinner(1904 – 1990)
Edward Thorndike(1874 – 1949)
Operant conditioning
law of effect (Thorndike):
if a behaviour is followed by a ______ state of affairs,
the behaviour will be ______ likely to recur.
if a behaviour is followed by a ______ state of affairs,
the behaviour will be ______ likely to recur.
Operant conditioning
stimulus: response: consequence:
Operant conditioning
reinforcers:
strengthen the tendency to perform a response e.g., biological needs (food, water); social needs (approval,
acceptance)
punishers:
aversive outcomes that reduce the tendency to perform a response
reinforcement:
positive reinforcement _____ something _____ to increase likelihood of a given
behaviour e.g., pay Johnny $5 after he cleans his room
negative reinforcement _____ something _____ to increase likelihood of a given
behaviour e.g., stop playing loud music so your roommate is nice to you
Operant conditioning
Operant conditioning
punishment:
positive punishment _____ something _____ to decrease likelihood of a given
behaviour e.g., spank Johnny for talking back to you
negative punishment _____ something _____ to decrease likelihood of a given
behaviour e.g., time-outs
Operant conditioning
schedules of reinforcement:
continuous schedules every response is reinforced
partial schedules responses are reinforced only some of the time
Operant conditioning
Operant conditioning
ratio schedules:
a certain # of responses must occur before reinforcement is delivered fixed ratio: variable ratio:
Operant conditioning
interval schedules:
reinforcement depends on how much TIME has passed since last reinforcement
fixed interval: variable interval:
Operant conditioning
discrimination:
occurs when there is differential responding to different stimuli discriminative stimulus: accounts for situational specificity of behaviour
Operant conditioning
Operant conditioning
superstitious behaviour:
develops because of an accidental relationship between a response and reinforcement e.g., wearing a red shirt to your exams for “luck”
Observational learning
Albert Bandura(1925 – )
Observational learning
observational learning:
occurs when 1 person performs an act, and another person observes and acquires the ability to repeat the act
Observational learning
variables influencing observational learning:
attention for encoding
Observational learning
retention
production
Observational learning
performance
acquisition vs. performance:
Bandura’s Bobo doll study (1965) measured acquisition & spontaneous
performance
Observational learning
Observational learning
0
0.5
1
1.5
2
2.5
3
3.5
4
model rewarded no consequences model punished
# o
f im
itat
ive
acts
per
form
ed
acquisition performance
Bandura (1965):