Questions & explanations
1. How does delay discounting differ from impulsivity?
Delay discounting is a specific measure of how much a person devalues delayed rewards, while impulsivity is a broader trait that includes acting without thinking and seeking immediate gratification. Delay discounting is a behavioral measure that can be calculated from choices in experiments. Impulsivity may also involve risk-taking and lack of planning. However, high delay discounting is often considered a component of impulsivity. Someone with high delay discounting tends to make impulsive choices. But impulsivity can also stem from other factors like poor self-control or attention deficits. Understanding delay discounting helps target one aspect of impulsive behavior.
2. What is latent inhibition?
Latent inhibition is a learning effect where prior exposure to a neutral stimulus (CS) alone, without any consequence, slows down later conditioning when that stimulus is paired with an unconditioned stimulus (US). For example, if you hear a bell many times for no reason, you will later learn the bell-food association more slowly than if the bell was new. The prior exposure makes the stimulus less surprising or less attention-grabbing, so it takes longer to form the new association. This effect is different from extinction because in latent inhibition the stimulus was never paired with anything before. It shows that not all stimuli are equally easy to condition.
3. How does relational frame theory explain the development of verbal behavior?
RFT explains verbal behavior as derived relational responding that is trained and generalized. Children learn to relate words to objects and events through interactions with caregivers. For example, a child learns that the word "dog" stands for an animal (coordination frame). Later, they learn frames like comparison ("big dog"), opposition ("not a cat"), and hierarchy ("animal includes dogs"). These relations allow the child to understand and generate new sentences without direct teaching. RFT sees language as a set of relational skills that enable complex thinking. Thus, verbal behavior is built from simple relational frames that combine into networks.
4. How does relational frame theory differ from traditional stimulus equivalence?
Traditional stimulus equivalence focuses only on three specific relations: reflexivity, symmetry, and transitivity. Relational frame theory (RFT) extends this by covering many other relations like opposition, comparison, and hierarchy. RFT also treats derived relational responding as a learned skill rather than something that emerges automatically from matching. Additionally, RFT explains how transformation of stimulus functions happens through relations, not just equivalence. RFT provides a broader framework for language and cognition. Unlike equivalence theory, RFT emphasizes that arbitrary relational responding is reinforced by the verbal community.
5. What is a limitation of the Rescorla-Wagner model when applied to habituation?
The Rescorla-Wagner model was designed for associative learning with clear outcomes, like Pavlovian conditioning. Habituation often occurs with no obvious outcome other than the stimulus itself—the stimulus is both cue and outcome. The model assumes learning only when there is a prediction error about a separate event. In habituation, the 'outcome' is the same stimulus, which the model doesn't handle well. Also, the model cannot explain spontaneous recovery (the return of response after rest) without adding extra assumptions. It treats habituation as a decrease in associative strength, but real habituation may involve separate mechanisms.
6. Give an example of delay discounting in everyday life and explain how it affects the choice.
A common example is deciding between eating a tasty but unhealthy snack now (immediate reward) versus eating a healthy meal and being fit later (delayed reward). The immediate pleasure of the snack is strong, while the future health benefit seems less valuable because it is far away. Delay discounting makes the snack more attractive. For instance, someone might take a slice of cake now instead of sticking to a diet for weight loss in months. This is why many people struggle with long-term goals like saving money or exercising regularly. Understanding delay discounting can help design ways to make future rewards more immediate.
7. Compare latent inhibition with extinction.
Latent inhibition and extinction both involve a reduction in conditioned responding, but they happen at different stages. Latent inhibition occurs before conditioning: pre-exposure to the CS alone slows later learning. Extinction occurs after conditioning: repeated presentation of the CS without the US reduces the conditioned response. In latent inhibition, the CS was never paired with the US during pre-exposure, so no conditioned response was learned yet. In extinction, the CS had been paired with the US, and then the pairing stops. Both show that stimulus exposure without consequence changes learning, but in different ways.
8. Compare positive and negative prediction errors in terms of learning.
Positive prediction errors (better than expected) cause increased dopamine firing and strengthen the association between cue and reward. This leads to learned approach or increased expectation. Negative prediction errors (worse than expected) cause a decrease in dopamine firing and weaken the association. This leads to extinction or reduced expectation. Both types are important for adjusting behavior to match reality. For example, if a food always appears after a tone, but starts appearing less often, the negative error helps reduce the conditioned response. Together, they allow flexible learning in changing environments.
9. Explain how prediction error and NMDA receptors work together in classical conditioning.
In classical conditioning, a tone (CS) is followed by a reward (US). When the reward is unexpected (positive prediction error), dopamine is released. This dopamine acts on neurons that also receive input from the tone. NMDA receptors on these neurons open because the CS and US co-occur, allowing calcium entry. The dopamine boost makes the NMDA-dependent plasticity stronger. As a result, the tone starts to predict the reward, and the animal learns. If the reward is already expected, no prediction error occurs, dopamine is low, and little learning happens. This system ensures that only surprising events drive new learning.
10. Compare the Rescorla-Wagner model's explanation of habituation with the dual-process theory (Sokolov).
The Rescorla-Wagner model explains habituation through reduced prediction error in associative learning. The dual-process theory says habituation results from a simple stimulus-response process (like a reflex weakening) and sensitization. Rescorla-Wagner requires a prediction about the outcome; dual-process does not need expectations. In Rescorla-Wagner, dishabituation occurs only if the stimulus changes enough to increase prediction error. Dual-process explains dishabituation as a separate sensitization process overriding habituation. The models differ: one is cognitive-associative, the other is behavioral-reflex based.
11. How does a rule like 'study hard to get good grades' affect behavior differently than direct experience?
A rule like 'study hard to get good grades' tells you what to do to get a reward in the future, even if you have never studied and received good grades before. Direct experience would require you to study and then see that grades improve. With the rule, you start studying immediately without trial and error. But if the rule is wrong (e.g., studying incorrectly), you may keep following it despite bad results because rules can make behavior less sensitive to actual outcomes. Direct experience lets you adjust based on what really happens. Rules are efficient but can lead to superstitious behavior if they are inaccurate.
12. What is the difference between rule-governed and contingency-shaped behavior?
Contingency-shaped behavior is learned through direct contact with consequences. For example, touching a hot stove once makes you avoid it in the future. Rule-governed behavior is controlled by a verbal rule, even without direct experience. For instance, someone tells you not to touch the stove because it is hot, so you avoid it. Rule-governed behavior can be learned faster and without risk, but it can also be less flexible. Contingency-shaped behavior is often more sensitive to changes in the environment, while rule-governed behavior may persist even when the rule no longer applies. Both interact in everyday life.