schedules of reinforcement
DESCRIPTION
Schedules of Reinforcement. Lesson 15. Schedules of RFT. Frequency of RFT after response is important Continuous RFT RFT after each response Fast Acquisition shaping Partial RFT RFT after only some responses Conditions set ~. Partial Schedule of RFT. Do not reinforce every response - PowerPoint PPT PresentationTRANSCRIPT
Schedules of Reinforcement
Lesson 15
Schedules of RFT
Frequency of RFT after response is important
Continuous RFT RFT after each response Fast Acquisition shaping
Partial RFT RFT after only some responses Conditions set ~
Partial Schedule of RFT
Do not reinforce every response Slower acquisition start CRF shift to partial
Different patterns of RFT produce different patterns of responding Cumulative response curves steeper curve higher operant
strength e.g., higher motivation ~
number ofresponses
Time
higher operant strength
lower operant strength
Cumulative Response Curve
Typical RFT Patterns
Ratio RFT after certain number of responses
Interval RFT after certain time interval
Fixed Same ratio or interval each time
Variable Average ratio or interval ~
patterns of RFT are combined
Fixed Variable
Ratio
Interval
FR VR
FI VI
Schedules produce different response rates
In general… Ratio > Interval Variable > Fixed VR = highest ~
Ratio patterns of response Animal controls RFT
faster responses faster RFT Fixed Ratio
high ratio (FR50) hi response rate pause after each RFT Why?
Low ratio (FR5) lower response rate
steady ~
number ofresponses
Time
Fixed Ratio Response Patterns
FR5
FR50
Variable Ratio
RFT after average of X responses VR10 = RFT after 7 responses
21 responses
30 responses 3 RFTs in 30 responses = 10 avg.
High, steady rate of response why?
Give an example of humans on VR ~
number ofresponses
Time
FR5
VRFR50
Interval Patterns of Response
RFT when R made after a period of time Experimenter controls RFT
Fixed Interval e.g., FI30
Scalloping slower responding after RFT speeds up as nears time for RFT
Human example? Why? ~
Interval Patterns of Response
Variable Interval RFT for response after avg. of X
seconds e.g. VI30
Slow, steady responding Human example?
What if they checked on FI schedule? ~
number ofresponses
Time
FI
VI
Variable Interval
Differential Schedules DRH
Differential RFT of high rates of responding High rate RFT Low rate extinction or punishment Time limit/deadline
DRLDifferential RFT of low rates of responding
Set interval between response Early B no RFT, timer reset ~
Differential Schedules Pacing schedules
too slow/fast no RFT, punishment DRO
Differential RFT of Other Behavior RFT of any B other than target B Used along with punishment
DRI Differential RFT of Incompatible Behavior
RFT of prosocial vs. antisocial ~
Schedule Effects Behavioral contrast
After change in RFT schedule Positive: lean rich Negative: rich lean often temporary
Behavioral momentum Or behavioral persistence B continues even when RFT
changes ~
Partial RFT Effect
Maintains behavior over time Learn more responses required for
RFT Surprising Reinforcers
Attract greater attention deprivation RFT magnitude
Gradual shift CRF Partial RFT ~
Schedule of RFT & Extinction
What if B no SR ? Behavior weakens Extinction
Extinction occurs quickly for CRF Why? ~
Schedule of RFT & Extinction
CRF expectation of RFT every time
Partial resistant to extinction RFT not expected every time
Variable more resistant than fixed fixed = expectation of regular RFT ~
Partial RFT Extinction Effect
PREE Why more resistant to extinction?
Discrimination Hypothesis May not immediately notice when
no longer RFT Frustration Theory
Learn to respond while frustrated RFT for responding while
frustrated ~