AP Psychology Quiz: Classical Conditioning
20 questions · exam conditions
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Classical ConditioningQuestion 1 of 20

Injection pain makes a clinic feared. A tone now comes before the clinic. The tone alone later causes fear.

Stimulus generalization
Higher-order conditioning
Spontaneous recovery
Backward conditioning
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AP Psychology Quiz

AP Psychology Quiz: Classical Conditioning

Practice Classical Conditioning in AP Psychology with focused quiz questions that help you check what you know, review explanations, and build confidence with test-style prompts.

What this quiz covers

This quiz focuses on Classical Conditioning, giving you a quick way to practice the rules, question types, and explanations that matter most for AP Psychology.

How to use this quiz

Try each quiz question before looking at the correct answer. Use the explanations to review missed ideas, then come back to similar questions until the pattern feels familiar.

All questions

Question 1

Injection pain makes a clinic feared. A tone now comes before the clinic. The tone alone later causes fear.

  1. Stimulus generalization
  2. Higher-order conditioning (correct answer)
  3. Spontaneous recovery
  4. Backward conditioning
Explanation: The clinic becomes a conditioned stimulus because it is paired with injection pain. Then the tone is paired with the clinic, which already triggers fear, so the tone gains fear through another layer of conditioning. Stimulus generalization is tempting because fear spreads to a new cue, but generalization depends on similarity to the original CS, not on being paired with it.

Question 2

After repeated drug injections in his kitchen, an addict injects in a friend's bathroom and reports a stronger high.

  1. Conditioned craving
  2. Stimulus generalization
  3. Spontaneous recovery
  4. Compensatory reaction (correct answer)
Explanation: Repeated injections in the kitchen condition your body to prepare a compensatory response that counteracts the drug, so the high is weaker there. In the friend's bathroom, that conditioned response is absent, and the drug effects hit harder. The tempting wrong answer is stimulus generalization, but a stronger high isn't a generalized response; it's the missing drug-compensating reaction.

Question 3

A rat conditioned to fear a light then gets light and tone paired with shock. Tone alone elicits little fear.

  1. Overshadowing by the light
  2. Latent inhibition of tone
  3. Blocking by prior training (correct answer)
  4. Stimulus generalization
Explanation: Because the light already predicts shock from earlier conditioning, it blocks learning about the tone when both are paired with shock: the tone adds no new information. The tempting wrong answer is overshadowing by the light, but overshadowing would happen even if both stimuli were trained together from the start without prior light fear.

Question 4

A tone paired with food on 50% of trials extinguishes more slowly than one paired on 100%. This reflects:

  1. Continuous reinforcement
  2. Partial reinforcement effect (correct answer)
  3. Spontaneous recovery of CR
  4. Higher-order conditioning
Explanation: When a response is reinforced only some of the time, extinction is slower because the absence of reinforcement is less predictable. That is the partial reinforcement effect. Continuous reinforcement (100%) is tempting, but it actually makes extinction faster because the animal expects reinforcement every time.

Question 5

A dog's conditioned salivation to a bell is extinguished. A similar phone buzz now makes it salivate.

  1. Stimulus generalization (correct answer)
  2. Spontaneous recovery
  3. Higher-order conditioning
  4. Stimulus discrimination
Explanation: Because the phone buzz is similar to the bell, the learned salivation response transfers to that new stimulus. That is stimulus generalization. Spontaneous recovery would be the original bell itself triggering salivation again after a rest period, not a similar sound triggering it.

Question 6

Tone predicts food; a novel light precedes that tone. Light alone now makes a dog salivate. This is:

  1. second-order conditioning (correct answer)
  2. stimulus generalization
  3. spontaneous recovery
  4. operant conditioning
Explanation: The tone already triggers salivation because it predicts food. Pairing the novel light with that tone lets the light become a conditioned stimulus too, producing salivation without food. This is second-order conditioning because a new cue is conditioned using an already conditioned cue. Stimulus generalization would be salivating to a similar tone, not this chain.

Question 7

An extinguished CR briefly returns after rest. This shows that extinction:

  1. permanently removes the CR
  2. inhibits, not erases, the CR (correct answer)
  3. is a form of generalization
  4. proves the US was too weak
Explanation: Spontaneous recovery, the brief return of the conditioned response after rest, shows that extinction suppresses the learned response rather than wiping it out. The tempting wrong answer is that extinction permanently removes the CR, but the reappearance proves the association remains. So extinction inhibits, not erases, the CR.

Question 8

A dog salivates to a metronome click. Which result best shows discrimination?

  1. Response to a similar tone
  2. Response to click, not a bell (correct answer)
  3. No response after no food
  4. Response returns after rest
Explanation: Discrimination means responding only to the exact conditioned stimulus and not to similar ones. If the dog salivates to the metronome click but not to a bell, it has learned to tell the two apart. A response to a similar tone would be generalization, not discrimination; no response after no food is extinction, and response returning after rest is spontaneous recovery.

Question 9

A tone must signal an air puff to the eye. Best timing?

  1. Tone after puff, no overlap
  2. Tone and puff simultaneous
  3. Puff 0.5s before the tone
  4. Tone 0.5s before the puff (correct answer)
Explanation: The tone must predict the air puff, so it should start just before the puff, about 0.5 seconds. This lets the brain associate the tone as a signal. The most tempting wrong choice is presenting the tone and puff at the same time; simultaneous stimuli don't clearly establish the tone as a predictor.

Question 10

Rats avoid a flavor paired once with nausea six hours later. This challenges the usual need for:

  1. repeated extinction trials
  2. a clear observable response
  3. immediate CS-US contiguity (correct answer)
  4. a biologically salient US
Explanation: Classical conditioning usually requires the CS and US to occur close together in time. Rats learn taste aversion even when nausea arrives six hours after the flavor, so learning occurs without immediate contiguity. The tempting wrong answer is that the US must be biologically salient, but nausea is exactly that; the delay, not the salience, is what's being challenged.

Question 11

After one nausea episode from spoiled sushi, a person avoids sushi for months. What principle best explains this?

  1. This is biological preparedness (taste aversion) because organisms readily learn food–illness associations, often after a single pairing. (correct answer)
  2. This is generalization because the person avoids sushi only when it is served in the same restaurant as before.
  3. This is fixed-ratio reinforcement because avoiding sushi is strengthened after being rewarded every set number of avoidance responses.
  4. This is spontaneous recovery because nausea returns after a rest period even though the person never eats sushi again.
Explanation: Biological preparedness, specifically taste aversion learning, explains why a single pairing of sushi with nausea creates a lasting avoidance. Organisms are evolutionarily prepared to rapidly form associations between novel tastes and illness because this protects against poisoning. This specialized form of classical conditioning differs from typical conditioning by requiring only one trial, tolerating long delays between CS and UCS, and being highly resistant to extinction. This isn't generalization (which would involve avoiding similar foods), fixed-ratio reinforcement (an operant schedule), or spontaneous recovery (which involves return of an extinguished response). Taste aversion demonstrates how evolution shapes learning mechanisms for survival-relevant associations.

Question 12

A dog stops salivating to a bell after many bell-only trials. Which phenomenon explains this decline?

  1. Generalization, because the dog responds similarly to new sounds that resemble the bell heard during training.
  2. Extinction, because presenting the CS repeatedly without the UCS weakens the CS–UCS association and reduces the CR. (correct answer)
  3. Positive reinforcement, because salivating is followed by food and therefore increases salivating on later bell trials.
  4. Higher-order conditioning, because the bell becomes associated with a second neutral stimulus rather than with food.
Explanation: Extinction occurs when the conditioned stimulus (bell) is repeatedly presented without the unconditioned stimulus (food), causing the conditioned response (salivation) to gradually weaken and disappear. The dog learns that the bell no longer predicts food, so the CS-CR association breaks down. This differs from generalization (responding to similar stimuli), positive reinforcement (an operant concept), and higher-order conditioning (pairing CS with new neutral stimulus). Extinction demonstrates that classical conditioning is reversible - learned associations can be unlearned when the predictive relationship between stimuli no longer holds.

Question 13

A loud noise makes a baby startle. After a neutral rattle is paired with the noise, the rattle alone startles. What is the UCR?

  1. The rattle sound, because it begins as a neutral stimulus and later signals the loud noise after pairings.
  2. Startling to the rattle, because it is the learned response elicited by the conditioned stimulus after conditioning.
  3. Startling to the loud noise, because it is an unlearned reflexive response elicited by the unconditioned stimulus. (correct answer)
  4. Startling increases because the baby is reinforced with attention after startling, strengthening the behavior over time.
Explanation: The unconditioned response (UCR) is the natural, reflexive response that occurs to the unconditioned stimulus without any prior learning. In this example, the loud noise is the UCS that automatically triggers the startle response - this startling to the loud noise is the UCR. It's an innate defensive reflex that requires no conditioning. The rattle begins as a neutral stimulus and becomes the CS through pairing with the loud noise. The startling that occurs to the rattle alone after conditioning is the CR. This distinction between UCR (unlearned response to UCS) and CR (learned response to CS) is fundamental to understanding how classical conditioning creates new stimulus-response associations.

Question 14

In Pavlov's setup, food powder in a dog's mouth automatically causes drooling. What is the drooling to food?

  1. The UCR, because drooling is an unlearned reflexive response that occurs when the UCS (food) is presented. (correct answer)
  2. The CR, because drooling occurs only after a bell becomes associated with food through repeated pairings.
  3. The CS, because drooling starts as a neutral stimulus and later predicts the arrival of food powder.
  4. A punishment, because drooling reduces the likelihood of future food presentation in the experimental setting.
Explanation: In classical conditioning, the unconditioned stimulus (UCS) naturally elicits an unconditioned response (UCR) without any learning. The conditioned stimulus (CS) becomes associated with the UCS through repeated pairings during acquisition. Food powder naturally causes drooling as an automatic reflex - this is the UCR to the UCS (food). The bell would be the CS that, after conditioning, elicits the CR (drooling). Extinction occurs when the CS is presented without the UCS, while spontaneous recovery is the return of the CR after a rest period. Stimulus generalization allows similar stimuli to elicit the CR, while discrimination restricts the response to specific stimuli.

Question 15

A student hears the school bell (paired with stressful tests) and feels anxious. The anxiety is best labeled as what?

  1. The CR, because anxiety is a learned response elicited by the CS after repeated pairings with stressful tests. (correct answer)
  2. The UCR, because the bell naturally and automatically produces anxiety without any prior learning experiences.
  3. The UCS, because anxiety is an unconditioned stimulus that causes the bell to occur in the school environment.
  4. A reinforcer, because the anxiety increases bell-ringing behavior by providing a rewarding internal consequence.
Explanation: The conditioned response (CR) is the learned behavior that occurs when a conditioned stimulus (CS) is presented after acquisition. The school bell became a CS through repeated pairings with stressful tests (UCS), which naturally cause anxiety as an unconditioned response (UCR). After conditioning, hearing the bell alone elicits anxiety - this anxiety to the bell is the CR. The CR often resembles the UCR but is elicited by the learned CS rather than the natural UCS. Extinction could occur if the bell were heard repeatedly without stressful tests following. Spontaneous recovery might cause anxiety to return after extinction and a rest period. Generalization could cause anxiety to similar school sounds.

Question 16

A tone is presented 10 seconds before an air puff; conditioning occurs faster than when tone follows the puff. What factor matters?

  1. Timing/contiguity, because a CS that reliably precedes the UCS supports stronger prediction and faster acquisition. (correct answer)
  2. Overjustification, because external rewards reduce intrinsic motivation to blink when the tone is heard.
  3. Fixed-ratio schedule, because reinforcement after a set number of blinks increases learning speed.
  4. Generalization, because similar tones all become UCSs that naturally cause blinking without learning.
Explanation: Timing and contiguity are crucial factors in classical conditioning effectiveness. For optimal acquisition, the conditioned stimulus (CS) should precede the unconditioned stimulus (UCS) by a short interval, typically 0.5-1 second. When the tone precedes the air puff by 10 seconds, it creates a reliable predictive relationship - the tone signals that the air puff is coming. This forward conditioning is more effective than simultaneous or backward conditioning because the CS serves as a predictor of the UCS. Poor timing reduces the CS's predictive value and weakens acquisition. The CS must reliably predict the UCS for strong conditioning to occur. This differs from operant conditioning where consequences follow behavior to modify future responses.

Question 17

A light is paired with food until it elicits salivation; then a tone is paired with the light, and the tone elicits salivation. What is this?

  1. Higher-order conditioning, because an established CS (light) conditions a new neutral stimulus (tone) to elicit the CR. (correct answer)
  2. Extinction, because presenting the tone without food gradually weakens salivation until it disappears.
  3. UCS substitution, because the light becomes a UCS that naturally produces salivation without learning.
  4. Operant chaining, because salivation is reinforced step-by-step through consequences following each response.
Explanation: Higher-order conditioning occurs when an established conditioned stimulus (CS) is used to condition a new neutral stimulus, creating a chain of learned associations. First, the light became a CS through pairing with food (UCS), enabling it to elicit salivation as a conditioned response (CR). In the second phase, the tone (neutral stimulus) is paired with the light (now functioning as a conditioning stimulus), not with food directly. Through this process, the tone becomes a CS that can elicit salivation. This demonstrates that learning can occur through associations with other learned stimuli, not just primary reinforcers. The response is typically weaker than first-order conditioning and more susceptible to extinction.

Question 18

A person feels fear when seeing a dog after being bitten; later, fear occurs to a dog leash alone. The leash is best described as what?

  1. The CS, because the leash becomes associated with the bite experience and later elicits a conditioned fear response. (correct answer)
  2. The UCS, because the leash naturally causes fear without learning and requires no prior bite experience.
  3. The UCR, because the leash is the automatic fear response produced by the dog bite without any learning.
  4. A primary reinforcer, because the leash directly satisfies biological needs and strengthens fear behavior as a consequence.
Explanation: A conditioned stimulus (CS) is initially neutral but gains the ability to elicit a conditioned response (CR) through repeated pairing with an unconditioned stimulus (UCS). Initially, the dog leash was neutral and produced no fear response. After the person was bitten by a dog (UCS), which naturally causes fear (UCR), the leash became associated with dogs and the bite experience. Through this association, the leash became a CS that can now elicit fear as a CR even when no dog is present. This demonstrates how classical conditioning can create phobias to objects associated with traumatic experiences. Extinction could occur through repeated exposure to the leash without negative consequences. Generalization might cause fear of other dog-related items.

Question 19

After extinction, the conditioned response briefly returns the next day when the CS is presented. What is this called?

  1. Spontaneous recovery, because an extinguished conditioned response reappears after a time delay without additional CS–UCS pairings. (correct answer)
  2. Discrimination, because the organism learns to respond only to one specific CS and not to similar stimuli.
  3. Acquisition, because repeated CS–UCS pairings gradually build the conditioned response from near zero to strong levels.
  4. Avoidance learning, because the organism performs a behavior to prevent an aversive event from occurring again.
Explanation: Spontaneous recovery is the reappearance of an extinguished conditioned response after a rest period, without any new CS-UCS pairings. This phenomenon shows that extinction doesn't completely erase the learned association - it suppresses rather than eliminates it. The CR typically returns weaker than before extinction and will extinguish again quickly without renewed pairings. This differs from discrimination (differential responding), acquisition (initial learning), and avoidance learning (operant concept). Spontaneous recovery demonstrates that classical conditioning creates lasting memory traces that can resurface even after apparent extinction.

Question 20

After tone–food pairings, the tone alone elicits salivation. What is the tone?

  1. The unconditioned stimulus (UCS), because it naturally produces salivation without any prior learning or pairing with another stimulus.
  2. The conditioned response (CR), because it is the learned salivation that occurs after repeated pairings of tone and food.
  3. The conditioned stimulus (CS), because it was originally neutral and now triggers salivation after being paired with food. (correct answer)
  4. A reinforcer, because salivation increases the likelihood the tone will be presented again in the future by the experimenter.
Explanation: In classical conditioning, a neutral stimulus (tone) becomes a conditioned stimulus (CS) through repeated pairings with an unconditioned stimulus (food). The tone initially has no effect on salivation, but after being paired with food (which naturally causes salivation), the tone alone can trigger salivation. This demonstrates acquisition, where the CS-UCS association is formed. The tone is not the UCS because it doesn't naturally cause salivation, nor is it the response itself (CR). Unlike operant conditioning where behaviors are reinforced, classical conditioning involves automatic responses to stimuli, so the tone isn't a reinforcer.