Exam 4 (Ch 7-9) Flashcards
There are three events to consider in an analysis of instrumental learning, those are?
Skinner described instrumental conditioning in terms of a three-term contingency involving __ - __ - __
- The stimulus context (S)
- The instrumental response (R)
- The response outcome (O; AKA reinforcer)
S-R-O
What are the different S-R-O associations that exist?
Be able to explain and understand each association
- Law of effect by Thorndike; S-R association, with no learning about O (Characterizes habitual habits, becomes less about the goal so consequences become irrelevant; example: drug addiction)
- Pavlovian or Classical conditioning; S-O association (Positive or negative strengthening in association, also acts as reward expectancy or emotional state in instrumental conditioning)
- Instrumental conditioning; S-R association (positive or negative strengthening in behavior)
- Instrumental conditioning; R-O association (usually involves devaluing the reinforcer after conditioning; AKA reinforcer devaluation procedure, also used to understand drug-seeking behavior)
- Two Process Theory; S-R-O associations (Pavlovian CS can influence or motivate instrumental responding)
How can the Two Process Theory be tested?
Pavlovian Instrumental Transfer Experiment
The following is an example of what type of experiment and shows which association?
Phase 1
Instrumental: Lever pressing is reinforced by food
Lever press -> Food
Phase 2
Pavlovian: the response lever is removed from the experimental chamber and a tone is paired with food
Tone -> Food
Transfer Test
Present Pavlovian CS: participants are again permitted to perform the instrumental lever-press response, but now the Pavlovian CS (tone) is presented periodically.
Lever press -> Food
Tone vs. No Tone
Results
1. There tends to be an increase in lever pressing during the tone compared to when there’s no tone
2. Suggests there is a Pavlovian S-O connection influencing the instrumental response
- Pavlovian Instrumental Transfer Experiment
- S-R-O connection
The following is an example of what type of experiment and shows which association?
Phase 1
Instrumental: Rats trained to press either response lever reinforced by artificially sweetened water, eventually water is switched to ethanol
Lever press -> Sugar water
Lever press -> Ethanol
Phase 2
Pavlovian:
Test Group: the response levers are removed from the experimental chamber and above each lever is a light appeared for 10 seconds paired with ethanol
Control Group: light presents first, then ethanol is presented 10 seconds later
Light -> Food
Transfer Test
Present Pavlovian CS: participants are again permitted to perform the instrumental lever-press response for ethanol reinforcement, but now the Pavlovian CS (light) is presented periodically. (some trials appeared on the left and some on the right)
Lever press -> Ethanol
light left or right side
Results:
1. The rats pressed each response lever about twice per minute before the CS was presented.
2. For the unpaired group, lever pressing did not change much when the CS was presented either on the right or the left.
3. The paired group showed a significant increase in lever pressing during the CS period if the CS was presented on the same side as the lever the rat was pressing.
4. These results show that a Pavlovian CS for ethanol will increase instrumental responding reinforced by ethanol.
5. The increased lever pressing during the CS shows that an independently established S–O association can facilitate instrumental responding reinforced by that outcome.
- Response Interactions in Pavlovian Instrumental Transfer Experiment
- S-R-O Connection
The following is an example of which procedure and shows which association?
Phase 1
Training: A two-choice concurrent schedule of reinforcement was used. The two responses were pressing two different keys on a computer keyboard. The cigarettes and chocolate bars earned were summed across trials, and the corresponding number of each item was placed in a basket on the participant’s desk.
button 1 -> 1/4 picture of a cigarette
button 2 -> 1/4 picture of a chocolate bar
Phase 2
Outcome Devaluation: value of outcome is reduced by satiating the participants with the corresponding reinforcer.
Group 1: Smoking a cigarette is reduced in value (Smoke an entire cigarette)
Group 2: Eating chocolate is reduced in value (Ate up to 8 chocolate bars in 10 minutes)
Test
participants were again tested on the concurrent schedule but this time they were told that although they would continue to earn cigarettes and chocolate bars, they would not find out how many of each they obtained until the end of the session. This was intended to maintain responding on the basis of the current status of the memory of each reinforcer.
Button 1?
Button 2?
Results:
1. During training, about 50% of the responses were made on the cigarette key, with the remaining responses performed for chocolate bars.
2. This indicates that the two outcomes were equally preferred before devaluation.
3. When the tobacco outcome was devalued, responding on the cigarette key significantly declined.
4. In contrast, when the chocolate outcome was devalued, responding on the cigarette key increased, indicating a decline in the chocolate response.
5. Thus, devaluation produced a decline in behavior specific to the response whose reinforcer had been devalued.
- Reinforcer Devaluation Procedure
- R-O association
A principle that assumes that reinforcement depends on how much more likely the organism is to perform the reinforcer response than the instrumental response before an instrumental conditioning procedure is introduced. The greater the differential probability of the reinforcer and instrumental responses during baseline conditions, the greater is the reinforcement effect of providing opportunity to engage in the reinforcer response after performance of the instrumental response.
AKA
- Premack Principle
- Differential Probability Principle
A theory that assumes that species-typical consummatory responses (eating, drinking, and the like) are the critical features of reinforcers.
Consummatory-response theory
An explanation of reinforcement according to which restricting access to a response below its baseline rate of occurrence ________ ________ is sufficient to make the opportunity to perform that response an effective positive reinforcer.
Response-deprivation hypothesis
The preferred distribution of an organism’s activities before an instrumental conditioning procedure is introduced that sets constraints and limitations on response allocation.
Behavioral bliss point
A model of instrumental behavior, according to which participants respond to a response–reinforcer contingency in a manner that gets them as close as possible to their behavioral bliss point.
Minimum-deviation model
The relation between how much of a commodity is purchased and the price of the commodity.
Demand Curve
The degree to which price influences the consumption or purchase of a commodity. If price has a large effect on consumption, elasticity of demand is high. If price has a small effect on consumption, elasticity of demand is low.
Elasticity of demand
Given two responses of different likelihood, H and L, the opportunity to perform the higher probability response (H) after the lower probability response (L) will result in reinforcement of response L. (L ® H reinforces L.) The opportunity to perform the lower probability response (L) after the higher probability response (H) will not result in reinforcement of response H. (H ® L does not reinforce H.)
This describes what?
The Premack Principle
- drinking a drop of sucrose is a high-probability response, and as one might predict, sucrose is effective in reinforcing lever pressing.
- Running in a running wheel is also a high-probability response in rats. Thus, one might predict that running would also effectively reinforce lever pressing.
Are examples of what?
The Premack Principle
How can the premack principle be used in a clinical setting and what did it encourage?
- Schizophrenia offered incentive to sit down only if they worked on project
- Autism
- Encouraged thinking about reinforcers as responses rather than as stimuli.
How we choose to spend our time is based on trade-off’s and can be explained by what perspective?
The Response Allocation Approach
What are determinants of the elasticity of demand?
- Available Alternatives
- Relative Price
- Income
- Complementary commodities
A stimulus that controls the performance of instrumental behavior because it signals the availability (or nonavailability) of reinforcement.
Discriminative stimulus
Responding to test stimuli that are different from the cues that were present during training.
Stimulus generalization
A gradient of responding that is observed if participants are tested with stimuli that increasingly differ from the stimulus that was present during training.
Stimulus generalization gradient
Training with a stimulus discrimination procedure that results in stimulus discrimination.
stimulus discrimination training
Interference with the conditioning of a stimulus because of the simultaneous presence of another stimulus that is easier to condition.
Overshadowing
(in classical conditioning) A classical conditioning procedure in which one stimulus (the CS+) is paired with the US on some trials and another stimulus (the CS–) is presented without the US on other trials. As a result of this procedure, the CS+ comes to elicit a conditioned response and the CS–comes to inhibit this response.
(in instrumental conditioning) A procedure in which reinforcement for responding is available whenever one stimulus (the S+, or S D ) is present and not available whenever another stimulus (the S–, or S Δ ) is present.
Stimulus discrimination procedure
Differential responding in the presence of two or more stimuli.
Stimulus discrimination
A discrimination procedure in which reinforcement is provided when each of two stimuli appear by themselves (A+ and B+) but not when the two stimuli appear simultaneously (AB–).
negative patterning
A discrimination procedure in which reinforcement is provided when two stimuli (A and B) are presented simultaneously (AB+) but not when those stimuli appear by themselves (A–and B–).
positive patterning
A displacement of the highest rate of responding in a stimulus generalization gradient away from the S+ in a direction opposite the S–.
Peak-shift effect
This experiment illustrates several important ideas, including:
- Shows how to experimentally determine whether instrumental behavior has come under the control of a particular stimulus. Demonstrated by variations in responding related to variations in stimuli. AKA stimulus control. If an organism responds one way in the presence of one stimulus and in a different way in the presence of another stimulus, its behavior has come under the control of those stimuli.
- Differential responding to two stimuli also indicates that the pigeons were treating each stimulus as different from the other. AKA stimulus discrimination. If an organism does not discriminate between two stimuli, its behavior is not under the control of those cues.
- In the absence of special procedures, one cannot always predict which of the various stimuli an organism experiences will gain control over its instrumental behavior.
Trains pigeons to respond to red circle and white triangle
Experiment conducted by Reynolds (1961)