Classical conditioning practice gets easier when you label events in time order. First identify what already produces a response. Then find the cue that is paired with that event. Finally, identify the response to the cue after learning. Don’t start by guessing which word in the story sounds most like a stimulus.
The eight fictional scenarios below focus on the labels students often mix up: US, UR, NS, CS, and CR. You’ll also practice identifying missing evidence and distinguishing a stimulus association from a behavior followed by a consequence. These are study examples, not instructions for conducting experiments on people or animals.
A labeling method you can use on any scenario
In classical conditioning, an association between stimuli allows a previously neutral cue to elicit a learned response. An unconditioned stimulus, or US, elicits the relevant response without the pairing being studied. The unconditioned response, or UR, is that response to the US. Some courses use UCS and UCR instead.
The neutral stimulus, or NS, initially does not elicit the target response. After learning, that cue is called the conditioned stimulus, or CS. The response it elicits is the conditioned response, or CR. See OpenStax’s classical conditioning explanation for the vocabulary and basic sequence.
Draw three lines on your page: before learning, during pairing, and after learning. On the first line, write US followed by UR. On the second, put the initially neutral cue before the US. On the third, write CS followed by CR. Always name the response’s trigger, even if two responses look similar.
For your answer sheet, leave space for five labels and one evidence sentence per question. The evidence sentence should say what changed between the beginning and end of the story. If the story never provides that change, mark the missing information instead of supplying an imaginary learning history.
Eight practice examples with explained answers
1. A patterned card and a sour taste
Scenario: In a fictional demonstration, a sour taste in Maya’s mouth produces salivation. A striped card initially produces no salivation. Across several pairings, the card appears just before the sour taste. Later, the card alone produces salivation.
Answer: The sour taste is the US. Salivation to that taste is the UR. The striped card begins as the NS and becomes the CS. Salivation to the card alone is the CR.
The card has the same appearance throughout the story, but its role changes. Before pairing, it doesn’t elicit the target response. After pairing, it does. Don’t call the card both neutral and conditioned at the same moment in the sequence.
A complete evidence sentence is: “The card initially produced no salivation, but after it preceded the sour taste, it elicited salivation alone.” That sentence explains why the label is justified.
2. A light before an air puff
Scenario: In a fictional learning task, an air puff directed toward the eye elicits a blink. A small blue light initially doesn’t elicit that blink. The light repeatedly precedes the puff. Later, a blink occurs when the light appears before any puff arrives.
Answer: US: air puff. UR: blink to the puff. NS, then CS: blue light. CR: blink to the blue light after pairing.
The puff and the light are stimuli. The blink is a response. Writing “eye” for the UR identifies a body part, not what happens. Writing “air puff” for the UR identifies the trigger, not the reaction.
Notice the final clause: the blink occurs before a puff arrives. That information matters because a blink caused only by the current puff would not demonstrate a learned response to the light.
3. Same response word, different labels
Scenario: A fictional rabbit salivates when food is placed in its mouth. A soft chime initially does not produce salivation. After the chime has repeatedly preceded food, the rabbit salivates to the chime alone. A student writes “salivation is always the UR.” Is that correct?
Answer: No. Salivation to food is the UR in this scenario. Salivation to the learned chime is the CR. Food is the US, while the chime changes from NS to CS.
The student’s answer loses the trigger. Repair it by writing two separate phrases: “salivation to food” and “salivation to the chime.” The response word alone cannot settle the label.
When your instructor presents a scenario with similar-looking reactions, don’t assume you have found a contradiction. Check what elicits each reaction and whether the relevant association has been learned.
4. A similar cue that was never paired
Scenario: Continue the blue-light example from question 2. After learning, the subject blinks to the original blue light. A slightly different blue-green light, never previously paired with the puff, also elicits a blink. What process does the new observation illustrate?
Answer: Stimulus generalization. The response occurs to a cue similar to the trained CS. The original air puff remains the US, and the learned blink to the original blue light remains the CR in that training sequence.
Don’t invent a second training phase for the blue-green light. The problem explicitly says it was never paired with the puff. That makes similarity to the trained cue the relevant feature.
For a comparison note, write: “Generalization: response extends to a similar cue.” The contrasting idea, discrimination, involves responding differently to distinguishable cues. These terms describe response patterns, not whether an answer is morally good or bad.
5. A response declines, then returns
Scenario: Return to Maya’s striped card from question 1. The card is now presented repeatedly without the sour taste, and salivation to the card declines. After a break, the card briefly elicits salivation again, without a new card-and-taste pairing.
Answer: The decline during unpaired card presentations illustrates extinction. The return after a break illustrates spontaneous recovery. Keep those phases separate in your explanation.
Don’t label the renewed response “new acquisition” when the story specifically says no new pairing occurred. Don’t conclude that extinction permanently erased the association either. The return is the observation the second half of the question asks you to explain.
OpenStax’s section on general conditioning processes distinguishes extinction, recovery, and generalization. Use the story’s timeline to decide which term applies, rather than selecting whichever term you reviewed most recently.
6. A behavior earns a consequence
Scenario: Each time Alex submits a practice quiz, an app awards a point. Over the following weeks, Alex submits practice quizzes more often. The story gives no initially neutral cue paired with an event that already elicits a target response. Must you fill in US, UR, CS, and CR?
Answer: No. This description supports an operant-conditioning interpretation: submitting a quiz is followed by an added consequence, and that behavior increases. The point functions as positive reinforcement in the stated scenario.
A tempting wrong answer is “quiz = CS, point = CR.” A point is an event provided by the app, not Alex’s elicited response. That label pair doesn’t describe the relationship the story actually reports.
For more consequence-based practice, use negative reinforcement versus punishment examples. The useful question here is whether the evidence describes stimuli being associated or behavior changing after its consequences.
7. An everyday story with missing evidence
Scenario: Jordan feels alert whenever a favorite study playlist starts. The question provides no information about Jordan’s earlier response to the music or what events accompanied it. A classmate concludes that the playlist must be a CS and asks you to identify the US.
Answer: There isn’t enough information to establish that conditioning sequence. The playlist might participate in a learned association, but the story doesn’t identify the relevant prior event, its unconditioned response, or the pairing history.
A strong answer states what is missing: “What previously elicited alertness, did the playlist reliably precede it, and did the response to the playlist change?” It doesn’t invent coffee, an alarm, or a reward.
This is a useful check on your own examples. A familiar routine can be memorable without providing enough evidence to assign every conditioning label. Write a fuller scenario before treating it as a clean practice question.
8. Transfer the method to a new description
Scenario: In a fictional task, a sudden loud sound elicits a startle. A checkerboard symbol initially does not. The symbol repeatedly appears just before the sound. Later, the symbol alone elicits a startle. Another student says the loud sound becomes the CS because it is the most noticeable event.
Answer: The loud sound is the US; startle to it is the UR. The checkerboard symbol changes from NS to CS. Startle to the symbol after pairing is the CR. How noticeable an event seems doesn’t determine its label.
Write the same three-line sequence you used earlier, replacing the nouns. If your labels change simply because the scenario uses a loud sound instead of a taste or puff, return to the before-learning observation.
These examples are simplified descriptions for analysis. They don’t establish how every individual would respond, and they don’t turn an invented scenario into evidence from an actual experiment.
Make your notes test the distinction
On the front of a study card, put an original scenario with the timeline intact. On the back, put the five labels, their triggers, and one tempting wrong answer with its correction. Keep the explanation short enough that you can check the relationship at a glance.
Then change one fact and answer again. In question 2, remove the statement that the light alone elicits a blink. You now have evidence of pairing but no reported result demonstrating that the light elicits the learned response. Changing that single fact should change how confidently you answer.
Compare your terminology with your instructor’s notes and relevant Psychology of Learning materials. Use Browse Documents to find complementary course coverage, checking that another student’s abbreviations match the ones your class uses.
Frequently asked questions
Are NS and CS different objects?
Often they are the same cue at different stages. In question 1, the striped card is neutral before the pairing and conditioned afterward.
Does neutral mean a cue causes no response at all?
Here it means the cue initially doesn’t elicit the particular response being studied. A person could notice the card without salivating to it.
Is every habit classical conditioning?
No. A description of a repeated action alone doesn’t establish the required association. Identify the learning relationship supported by the details provided.
What makes a useful shared practice sheet?
Include original scenarios, clear timelines, explained labels, and honest missing-information cases. Upload your own notes to help other students using StudyUpload’s upload page. Share material you have permission to share, and label it as student-created practice.