Skinner’s experiments extend Thorndike’s thinking, especially his law of effect. This law states that rewarded
behaviour is likely to occur again.
Hypothesized that rats could be conditioned to elicit a certain behavior, in order to obtain a reward
Operant conditioning involves operant behaviour, a behaviour
that operates on the environment, producing rewarding or
punishing stimuli.
Operant conditioning involves learning how to control one’s response to elicit a reward or avoid a punishment
Primary & Secondary Reinforcers
Primary
An innately reinforcing stimulus like food or drink.
Secondary
A learned reinforcer that gets its reinforcing power through
association with the primary reinforcer.
Immediate & Delayed
Reinforcers
Immediate
A reinforcer that occurs instantly after a behaviour. e.g
a rat gets a food pellet for a bar press.
Delayed
A reinforcer that is delayed in time for a
certain behaviour. e.g. a paycheck that comes at
the end of a week.
Shaping
Shaping is the operant conditioning procedure in which
reinforcers guide behaviour towards the desired target
behaviour through successive approximations.
Negative Reinforcement
and Punishment
Negative Reinforcement
Removing an unpleasant stimulus
Punishment
1. Introducing an unpleasant stimulus
2. Withholding a pleasant stimulus
An adverse event that decreases the behavior it follows
Negative Punishment
The withdrawal of a pleasant stimulus
Positive Punishment
Introduction of a negative stimulus: spanking
Punishment can result in:
Unwanted fears
Violence
Agression
Reinforcement Schedules
Continuous Reinforcement
Reinforces the desired response each time it occurs.
Partial Reinforcement
Reinforces a response only part of the time.
This is slower in acquisition, however, it is the hardest to extinguish
Ratio Schedules
Fixed-ratio schedule
Reinforces a response only after a specified number
of responses. e.g., piecework pay.
Variable-ratio schedule
Reinforces a response after an unpredictable
number of responses. i.e. gambling
This is hard to extinguish because
of the unpredictability.
Interval Schedules
Fixed-interval schedule
Reinforces a response only after a specified
time has elapsed.
Variable-interval schedule
Reinforces a response at unpredictable time
intervals, which produces slow, steady
responses.
Motivation
Intrinsic Motivation
The desire to perform a behavior for its own sake
Extrinsic Motivation
The desire to perform a behavior because of an outside influence: rewards/punishment