Schedules of Reinforcement 11/11/11

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Schedules of Reinforcement 11/11/11

Reinforcement Schedules Intermittent Reinforcement: A type of reinforcement schedule by which some, but not all, correct responses are reinforced. Intermittent reinforcement is the most effective way to maintain a desired behavior that has already been learned.

Continuous Reinforcement Continuous Reinforcement: A schedule of reinforcement that rewards every correct response given. Example: A vending machine. What are other examples?

Schedules of Intermittent Reinforcement Interval schedule: rewards subjects after a certain time interval. Ratio schedule: rewards subjects after a certain number of responses. There are 4 types of intermittent reinforcement: Fixed Interval Schedule (FI) Variable Interval Schedule (VI) Fixed Ratio Schedule (FR) Variable Ratio Schedule (VR)

Interval Schedules Fixed Interval Schedule (FI): A schedule that a rewards a learner only for the first correct response after some defined period of time. Example: B.F. Skinner put rats in a box with a lever connected to a feeder. It only provided a reinforcement after 60 seconds. The rats quickly learned that it didn t matter how early or often it pushed the lever, it had to wait a set amount of time. As the set amount of time came to an end, the rats became more active in hitting the lever.

Interval Schedules Variable Interval Schedule (VI): A reinforcement system that rewards a correct response after an unpredictable amount of time. Example: A pop-quiz

Ratio Schedules Fixed Ratio Schedule (FR): A reinforcement schedule that rewards a response only after a defined number of correct answers. Example: At Safeway, if you use your Club Card to buy 7 Starbucks coffees, you get the 8th one for free.

Ratio Schedules Variable Ratio Schedule (VR): A reinforcement schedule that rewards an unpredictable number of correct responses. Example: Buying lottery tickets

Schedules of Reinforcement Number of responses 1000 Fixed Ratio Variable Ratio Intermittent Reinforcement Schedules- Skinner s laboratory pigeons produced these responses patterns to each of four reinforcement schedules 750 500 Rapid responding near time for reinforcement Fixed Interval For people, as for pigeons, research linked to number of responses (ratio) produces a higher response rate than reinforcement linked to time elapsed (interval). Variable Interval 250 Steady responding 0 10 20 30 40 50 60 70 Time (minutes) 80

Primary and Secondary reinforcement Primary reinforcement: something that is naturally reinforcing: food, warmth, water Secondary reinforcement: something you have learned is a reward because it is paired with a primary reinforcement in the long run: good grades.

Two Important Theories Token Economy: A therapeutic method based on operant conditioning that where individuals are rewarded with tokens, which act as a secondary reinforcer. The tokens can be redeemed for a variety of rewards. Premack Principle: The idea that a more preferred activity can be used to reinforce a less-preferred activity.

Operant and Classical Conditioning Classical Conditioning Behavior is controlled by the stimuli that precede the response (by the CS and the UCS). No reward or punishment is involved (although pleasant and averse stimuli may be used). Through conditioning, a new stimulus (CS) comes to produce the old (reflexive) behavior. Extinction is produced by withholding the UCS. Learner is passive (acts reflexively): Responses are involuntary. That is behavior is elicited by stimulation. Operant Conditioning Behavior is controlled by consequences (rewards, punishments) that follow the response. Often involves rewards (reinforcement) and punishments. Through conditioning, a new stimulus (reinforcer) produces a new behavior. Extinction is produced by withholding reinforcement. Learner is active: Responses are voluntary. That is behavior is emitted by the organism.

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