Chapter 13 Schedules of Reinforcement Cooper Heron and

Chapter 13: Schedules of Reinforcement Cooper, Heron, and Heward Applied Behavior Analysis, Second Edition 1

Schedules of Reinforcement • Continuous Reinforcement (CRF) – Provides reinforcement for every occurrence of a behavior. – Advantageous for skill acquisition Cooper, Heron, and Heward Applied Behavior Analysis, Second Edition 2

Schedules of Reinforcement • Intermittent Schedules of Reinforcement (INT) – Used to strengthen established behaviors – Usually necessary for the progression to naturally occurring reinforcement. Cooper, Heron, and Heward Applied Behavior Analysis, Second Edition 3

Schedules of Reinforcement • Basic Schedules of Reinforcement – Ratio (instances) and Interval (time) • Ratio schedules require a number of responses before one response produces reinforcement • Interval schedules require and elapse of time before a response produces reinforcement. Cooper, Heron, and Heward Applied Behavior Analysis, Second Edition 4

Basic Schedules of Reinforcement • Ratio Schedules – Require a number of responses before one response produces reinforcement. – A fixed number of “instances” or “occurrences” of the correct target behavior. Cooper, Heron, and Heward Applied Behavior Analysis, Second Edition 5

Basic Schedules of Reinforcement • Interval Schedules – With an interval schedule, a specific amount of time elapses before a single response produces reinforcement – Reinforcement is contingent only on the occurrence of one response after the required time has elapsed. Cooper, Heron, and Heward Applied Behavior Analysis, Second Edition 6

Basic Schedules of Reinforcement • Fixed Schedules – With a fixed schedule, the response ratio or the time requirement remains constant. • Fixed Ratio 4 (FR 4) – Reinforcement is delivered after every 4 th correct response. • Fixed Interval 2 min (FI 2) – Reinforcement is delivered for the first response after the 2 minutes have elapsed. Cooper, Heron, and Heward Applied Behavior Analysis, Second Edition 7

Basic Schedules of Reinforcement • Fixed Ratio and Schedule Effects – Consistency of Performance • Produces a typical pattern of responding – After the first response of the ratio requirement, subject completes required responses with little hesitation – Postreinforcement pause follows reinforcement Cooper, Heron, and Heward Applied Behavior Analysis, Second Edition 8

Basic Schedules of Reinforcement • Fixed Ratio (FR) and Schedule Effects – Rate of Response • Often produce high rates of response • Larger the ratio requirement, the higher the rate of response. Cooper, Heron, and Heward Applied Behavior Analysis, Second Edition 9

Basic Schedules of Reinforcement • Fixed Ratio (FR) Schedule Effects A = Post reinforcement pause Responses B B = High rate of response “run” A C = reinforcer delivered upon emission of nth response C Time Cooper, Heron, and Heward Applied Behavior Analysis, Second Edition 10

Basic Schedules of Reinforcement • Variable Schedules – The response ratio or the time requirement can change from one reinforced response to another. – Variable Ratio – 4 (VR 4). An average of every 4 th correct occurrence – Variable Interval 2 minute (VI 2). Reinforcing the first occurrence after an averaged elapsed time of 2 minutes. Cooper, Heron, and Heward Applied Behavior Analysis, Second Edition 11

Basic Schedules of Reinforcement • Variable Ratio (VR) and Schedule Effects – Consistency of Performance • Produce consistent, steady rates of response • Do not produce a postreinforcement pause Cooper, Heron, and Heward Applied Behavior Analysis, Second Edition 12

Basic Schedules of Reinforcement • Variable Ratio (VR) and Schedule Effects – Rate of Response • Tends to produce a quick rate of response • To a degree, the larger the ratio requirement, the quicker the rate of response. Cooper, Heron, and Heward Applied Behavior Analysis, Second Edition 13

Basic Schedules of Reinforcement • Variable Ratio (VR) Schedule Effects Responses A = High steady rate of responding B = Reinforcement delivered after a varying number of required responses are emitted A Schedule Effects: B Time Cooper, Heron, and Heward Applied Behavior Analysis, Second Edition Ratio requirements are completed with a very high rate of response and little hesitation between responses. Postreinforcement pauses are not a characteristic of the VR schedule. Rate of response is influenced by the size of the ratio requirements 14

Basic Schedules of Reinforcement • Fixed Interval (FI) – Provides reinforcement for the first correct response following a fixed duration of time. – Elapse of time alone is not sufficient for reinforcer delivery. Cooper, Heron, and Heward Applied Behavior Analysis, Second Edition 15

Basic Schedules of Reinforcement • Fixed Interval (FI) Schedule Effects – Consistency of Performance • Typically produce a postreinforcement pause • Gradually accelerating rate of response toward the end of the interval is called an FI scallop Cooper, Heron, and Heward Applied Behavior Analysis, Second Edition 16

Basic Schedules of Reinforcement • Fixed Interval (FI) Schedule Effects – Rate of response • Tend to produce a slow to moderate of response • To a degree, the larger the fixed interval requirement, the longer the postreinforcement pause Cooper, Heron, and Heward Applied Behavior Analysis, Second Edition 17

Basic Schedules of Reinforcement • Fixed Interval (FI) Schedule Effects A = Postreinforcement pause B = increase in response rates as interval progresses and reinforcer becomes available Responses B C = reinforcer delivered contingent on first correct responses after interval A Schedule Effects: C Time Cooper, Heron, and Heward Applied Behavior Analysis, Second Edition FI schedules generate slow to moderates of responding with a pause in responding following reinforcement. Responding begins to accelerate toward the end of the interval. 18

Basic Schedules of Reinforcement • Variable Interval (VI) – Provides reinforcement for the first correct response following the elapse of variable durations of time – “Average” amount of time Cooper, Heron, and Heward Applied Behavior Analysis, Second Edition 19

Basic Schedules of Reinforcement • Variable Interval (VI) Schedule Effects – Consistency of Performance • Tends to produce a constant, stable rate of response. • Typically produces few hesitations between responses. Cooper, Heron, and Heward Applied Behavior Analysis, Second Edition 20

Basic Schedules of Reinforcement • Variable Interval (VI) Schedule Effects – Rate of responding • Tends to produce low to moderate of response. • The larger the average interval, the lower the overall rate of response Cooper, Heron, and Heward Applied Behavior Analysis, Second Edition 21

Basic Schedules of Reinforcement • Variable Interval (VI) Schedule Effects A = Steady response rate; few, if any, postreinforcement pauses Responses B = Reinforcer delivered A Schedule Effects: B Time Cooper, Heron, and Heward Applied Behavior Analysis, Second Edition A VI schedule generates a slow to moderate response that is constant and stable. There are few, if any, postreinforcement pauses with VI schedules 22

Thinning Intermittent Reinforcement • One of two methods commonly used: – Gradually increasing the response ratio or the duration of the time interval – Providing instructions such as rules, directions and signs to communicate the schedule of reinforcement. Cooper, Heron, and Heward Applied Behavior Analysis, Second Edition 23

Thinning Intermittent Reinforcement • Ratio Strain – A result of abrupt increases in ratio requirements – Characteristics include: avoidance, aggression, and unpredictable pauses in responding Cooper, Heron, and Heward Applied Behavior Analysis, Second Edition 24

Variations on Basic Intermittent Schedules of Reinforcement • Schedules of Differential Reinforcement of Rates of Responding – Provides an intervention for behavior problems associated with rate of response. – Variation of ratio schedules Cooper, Heron, and Heward Applied Behavior Analysis, Second Edition 25

Variations on Basic Intermittent Schedules of Reinforcement • Schedules of Differential Reinforcement of Rates of Responding – Differential reinforcement of high rates (DRH) • Reinforcement of responses higher than a predetermined criterion. Cooper, Heron, and Heward Applied Behavior Analysis, Second Edition 26

Variations on Basic Intermittent Schedules of Reinforcement • Schedules of Differential Reinforcement of Rates of Responding – Differential Reinforcement of Low Rates (DRL) • Responses are reinforced only when they are lower than the criterion. Cooper, Heron, and Heward Applied Behavior Analysis, Second Edition 27

Variations on Basic Intermittent Schedules of Reinforcement • Schedules of Differential Reinforcement of Rates of Responding – Definitions • Reinforcement is available only for responses that are separated by a given duration time • Sometimes referred to as Spaced-responding DRH or Space-responding DRL Cooper, Heron, and Heward Applied Behavior Analysis, Second Edition 28

Variations on Basic Intermittent Schedules of Reinforcement • Schedules of Differential Reinforcement of Rates of Responding – Full Session DRH • Provides reinforcement if the total number of responses during the session meets or exceeds a number criterion Cooper, Heron, and Heward Applied Behavior Analysis, Second Edition 29

Variations on Basic Intermittent Schedules of Reinforcement • Schedules of Differential Reinforcement of Rates of Responding – Full Session DRL • Provides reinforcement if the total number of responses during the session is at or below a number criterion Cooper, Heron, and Heward Applied Behavior Analysis, Second Edition 30

Variations on Basic Intermittent Schedules of Reinforcement • Schedules of Differential Reinforcement of Rates of Responding – Interval definition for DRH & DRL • Reinforcement is available only for responses that occur at a minimum or better rate of response over short durations of time during the session. Cooper, Heron, and Heward Applied Behavior Analysis, Second Edition 31

Variations on Basic Intermittent Schedules of Reinforcement • Schedules of Differential Reinforcement of Rates of Responding – Differential Reinforcement of Diminishing Rates (DRD) • Provides reinforcement of responses at the end of a pre-determined teim interval when the number of respones is less than a criterion that is gradually decreased across time intervals based on the individuals performance. Cooper, Heron, and Heward Applied Behavior Analysis, Second Edition 32

Variations on Basic Intermittent Schedules of Reinforcement • Progressive Schedules of Reinforcement – Systematically thins each successive reinforcement opportunity independent of the participant’s behavior. • Progressive Ratio Schedules of Reinforcement (PR) • Progressive Interval Schedules of Reinforcement (PI) Cooper, Heron, and Heward Applied Behavior Analysis, Second Edition 33

Variations on Basic Intermittent Schedules of Reinforcement • Progressive Schedules of Reinforcement – Using Progressive Schedules for Reinforcer Assessment • Provide an assessment procedure for identifying reinforcers that will maintain treatment effects across increasing schedule requirements. Cooper, Heron, and Heward Applied Behavior Analysis, Second Edition 34

Variations on Basic Intermittent Schedules of Reinforcement • Progressive Schedules of Reinforcement – Using Progressive Schedules for Intervention • Systematically increasing the ratio or interval requirements for reinforcement Cooper, Heron, and Heward Applied Behavior Analysis, Second Edition 35

Compound Schedules of Reinforcement • Combined elements of continuous reinforcement (CRF), the four intermittent schedules of reinforcement (FR, VR, FI, VI), differential reinforcement of various rates of responding (DRH, DRL), and extinction (CRF) Cooper, Heron, and Heward Applied Behavior Analysis, Second Edition 36

Compound Schedules of Reinforcement • Concurrent Schedule of Reinforcement (conc) – Occurs when (a) two or more contingencies of reinforcement (b) operate independently and simultaneously (c) for two or more behaviors. Cooper, Heron, and Heward Applied Behavior Analysis, Second Edition 37

Compound Schedules of Reinforcement • Concurrent Schedule of Reinforcement (conc) – Using Concurrent Schedules for Reinforcer Assessment • This schedule requires the participant to choose between two or more stimuli rather than indicating a preference for a given stimulus. Cooper, Heron, and Heward Applied Behavior Analysis, Second Edition 38

Compound Schedules of Reinforcement • Concurrent Schedule of Reinforcement (conc) – Using Concurrent Schedules for Intervention • Arranging two or more reinforcers for the participant to choose from contingent upon the occurrence of a target behavior. Cooper, Heron, and Heward Applied Behavior Analysis, Second Edition 39

Compound Schedules of Reinforcement • Concurrent Performances: Formalizing the Matching Law – Concurrent interval schedules – participants typically do not allocate all of their responses exclusively to the richer schedule. – Concurrent ratio schedules – participants are sensitive to the ratio schedules an tend to maximize reinforcement by responding primarily to the ratio that produces the higher rate of reinforcement. Cooper, Heron, and Heward Applied Behavior Analysis, Second Edition 40

Compound Schedules of Reinforcement • The Matching Law – Rate of responding typically is proportional to the rate of reinforcement received from each choice alternative. Cooper, Heron, and Heward Applied Behavior Analysis, Second Edition 41

Discriminative Schedules of Reinforcement • Multiple Schedules of Reinforcement (mult) – Presents two or more basic schedules of reinforcement in an alternating, usually random, sequence. – Basic schedules occur successively and independently. – A discriminative stimulus is correlated with each basic schedule and is present as long as the schedule is in effect Cooper, Heron, and Heward Applied Behavior Analysis, Second Edition 42

Discriminative Schedules of Reinforcement • Chained Schedules of Reinforcement (chain) – Similar to (mult) – Differs in three ways – • Basic schedules occur in a specific order • The behavior may be the same for all elements of the chain, or different behaviors may be required for different elements • Conditioned reinforcement for first behavior in the chain is the presentation of the second element and so on. Cooper, Heron, and Heward Applied Behavior Analysis, Second Edition 43

Non-discriminative Schedules of Reinforcement • Mixed Schedules (mix) – Identical to multiple schedules, except the mixed schedule has no discriminative stimuli correlated with the independent schedules – Example: mix FR 10 FI 1 schedule Cooper, Heron, and Heward Applied Behavior Analysis, Second Edition 44

Non-discriminative Schedules of Reinforcement • Tandem Schedules – Similar to the chained schedule except the tandem schedule does not use a discriminative stimulus – Example: FR 15 FI 2 schedule – participants makes 15 responses then reinforcement is delivered for the first response after 2 minutes of elapsed time. Cooper, Heron, and Heward Applied Behavior Analysis, Second Edition 45