The Peak-End Rule

Why Two Moments Can Rewrite a Whole Experience

A difficult evening can be remembered tenderly because of one honest conversation. A mostly pleasant holiday can be coloured by its final hour. Memory does not always keep a fair average-and that matters.

We remember experiences selectively: a vivid emotional moment and the way the story ended can become disproportionately influential.

The idea in one sentence:

When people look back on an experience, their overall judgement may be influenced especially strongly by its most emotionally intense moment and by how it ended-rather than by a perfect average of every moment.

The short answer

The peak-end rule is best understood as a tendency in retrospective evaluation-not a mathematical law of memory.

• What it is: a pattern in how some experiences are summarised afterwards.

• What it is not: proof that the middle never matters or that a pleasant ending erases real harm.

• Where it may appear: medical procedures, feedback, conflict, holidays, customer experiences and emotionally meaningful events.

• Main protection: compare the remembered story with the full pattern, duration and consequences of what actually happened.

1. Your memory is an editor, not a security camera

Imagine two dinners. The first is pleasant for almost the entire evening, but ends with a cutting remark and an awkward departure. The second includes tension in the middle, followed by a sincere repair and a warm goodbye. Which dinner will feel better when remembered next week?

A strict accounting system would total every minute and calculate an average. Human memory often works differently. It builds a story from selected moments. The most intense moment may become the emotional centre of that story, while the ending supplies its final punctuation.

This does not mean that all other moments disappear. It means that some moments may receive more weight than their duration alone would justify. The result can be useful-we cannot preserve every second-but it can also distort judgement.

2. What psychologists mean by “peak” and “end”

Question	Careful answer
What is the peak?	The most emotionally intense moment-not necessarily the most pleasant one.
What is the end?	How the experience feels as it concludes, not everything that happens after it.
What is remembered?	A retrospective summary that may give disproportionate weight to these moments.
What may be neglected?	The duration and the many ordinary moments between the peak and the ending.
Is it universal?	No. The effect varies with the type, complexity and meaning of the experience.

The peak can be positive or negative. At a wedding it might be an emotionally powerful speech; during an argument it might be the cruelest sentence. The end can also carry relief, disappointment, tenderness or unfinished tension.

The rule concerns remembered experience-how the episode is evaluated afterwards. It does not claim that the body experienced only two moments, that objective consequences are irrelevant, or that memory contains no detail.

The remembered story may spotlight one emotional peak and the ending while compressing many quieter moments.

3. The cold-water experiment that made the idea famous

In a classic 1993 experiment, participants placed a hand in painfully cold water during two trials. One trial lasted 60 seconds. The other repeated those 60 seconds and then continued for a further 30 seconds while the water became slightly warmer-still unpleasant, but less unpleasant than before.

When participants were asked which trial they would rather repeat, many selected the longer trial. Objectively, it contained more total discomfort. Yet it ended better. The final, less-painful phase appeared to improve the remembered experience.[1]

The paradox:

More total discomfort can sometimes be remembered as less unpleasant when the added period creates a gentler ending. That is a finding about memory-not a recommendation to add unnecessary suffering.

4. What studies of medical procedures found

Research involving patients undergoing colonoscopy or lithotripsy found that retrospective evaluations of discomfort were related strongly to the worst pain and the pain near the end of the procedure.[2] A later randomised colonoscopy trial tested whether giving some patients a less-painful final phase could change how the procedure was remembered.[3]

The study is striking because remembered discomfort can influence whether someone returns for necessary care. It is also ethically easy to misuse. A humane clinical lesson is not “prolong pain to improve the memory”. It is to minimise avoidable pain throughout, communicate clearly, preserve consent and-where clinically appropriate-avoid an unnecessarily abrupt or distressing ending.

Experienced suffering and remembered suffering are both relevant, but they are not interchangeable. Good care should not improve one by casually worsening the other.

5. The rule also appears in pleasant experiences-but imperfectly

Later research extended the idea beyond pain. In pleasurable experiences, peak and ending ratings sometimes helped predict how enjoyable the episode was remembered to be.[4] However, they were not flawless predictors, and the most memorable or unusual moment could sometimes matter more.

Complex experiences create important boundary conditions. In research where thousands of participants reconstructed the episodes of an entire day, the average of those episodes predicted the day’s overall evaluation better than a simple peak-end calculation; the final episode did not independently predict the judgement.[5]

Evidence check:

The peak-end rule is a useful heuristic, especially for clearly bounded emotional episodes. It should not be treated as a universal formula for whole days, relationships, illnesses or lives.

6. Six places it can quietly shape everyday life

Relationships

One explosive argument can dominate the memory of an otherwise caring week. Conversely, an affectionate reunion can temporarily soften the remembered impact of a repeating harmful pattern. Neither snapshot is the whole relationship.

Feedback and education

A learner may remember the sharpest criticism and the final sentence more clearly than a long, balanced discussion. Honest feedback can remain honest while ending with a specific next step and confidence that improvement is possible.

Meetings and work

A confusing meeting may be remembered more constructively when it ends with a clear decision, named responsibilities and appreciation for the work done. A polished closing cannot compensate for chronic disrespect, but clarity prevents avoidable frustration from becoming the final note.

Healthcare

The final moments of an appointment-whether a patient feels rushed out, heard, confused or safely oriented-may influence confidence and willingness to return. This is one reason summaries, questions and safety-netting matter.

Parenting and family life

A difficult morning does not have to end with shame. Repairing after a raised voice, naming what went wrong and reconnecting calmly can change what the child carries forward-without pretending the rupture never occurred.

Holidays and celebrations

People often remember a trip through a handful of vivid scenes and its departure. Deliberately leaving some unhurried space at the end may create a truer, kinder conclusion than finishing in panic and exhaustion.

7. The dangerous misuse: “End well and the rest will not matter”

The peak-end rule can become manipulative when it is used to package a poor experience attractively. A thoughtful goodbye does not cancel hours of neglect. An apology does not erase repeated coercion. A gift after mistreatment does not convert an unsafe relationship into a healthy one.

This distinction matters particularly in intermittent or abusive relationships. Intense affection and dramatic reconciliation may become powerful emotional peaks. They can influence memory and hope while the broader pattern remains harmful.

Reality check:

Judge important relationships and environments by their repeated pattern: safety, respect, accountability, freedom and consistency-not only by their most intense moment or most recent apology.

8. How to use the principle ethically

The goal is not to manufacture a false memory. It is to give genuine experiences a humane structure.

• Reduce avoidable distress across the whole experience first.

• Create one meaningful moment rather than constant artificial excitement.

• Close with clarity, appreciation, orientation or repair when these are honest.

• Do not use a pleasant ending to hide harm, pressure consent or discourage criticism.

• Invite people to describe the full experience, including ordinary and difficult moments.

A respectful ending can provide clarity and connection-but it should complete good practice, not disguise poor practice.

9. Practical exercise: the Full-Story Review

Use this five-minute exercise when one vivid moment-or the way something ended-seems to define the entire experience.

1. Name the episode. What exactly are you evaluating? Give it a clear beginning and end.

2. Find the peak. Which moment feels most emotionally intense? Was it pleasant, painful, frightening, relieving or meaningful?

3. Notice the ending. What happened during the final part, and what emotion did it leave behind?

4. Restore the middle. List three ordinary but representative moments that your quick memory is overlooking.

5. Check duration and pattern. How long did each part last? Was the peak an exception or an example of something repeated?

6. Write the balanced verdict. Complete: “The part I remember most is ____, but the fuller pattern was ____.”

A helpful final question:

If the peak and ending were removed from the story, what would the remaining experience tell you?

10. Final takeaway

We do not remember life as a complete recording. We remember stories-and stories favour emotionally powerful scenes and meaningful endings.

That knowledge can help us design kinder appointments, clearer meetings, more thoughtful celebrations and more genuine repairs. It can also protect us from allowing one dramatic moment to overrule a long pattern of evidence.

A good ending matters. A powerful moment matters. But neither deserves the authority to rewrite the whole truth.

Glossary

• Peak-end rule: The tendency for retrospective evaluations to give disproportionate weight to the most intense moment and the ending.

• Peak: The most emotionally intense point of an experience, whether positive or negative.

• Remembered utility: The value or unpleasantness assigned to an experience when looking back on it.

• Experienced utility: How pleasant or unpleasant the experience felt as it unfolded moment by moment.

• Duration neglect: Giving relatively little weight to how long an experience lasted when judging it afterwards.

• Retrospective evaluation: A judgement made after an experience has ended.

• Emotional salience: The quality of standing out because something is emotionally important or intense.

• Boundary condition: A circumstance in which an effect becomes weaker, changes or does not reliably occur.

• Repair: An accountable effort to acknowledge a rupture, address its impact and restore safety or connection.

References and further reading

1. Kahneman, D., Fredrickson, B. L., Schreiber, C. A., & Redelmeier, D. A. (1993). When more pain is preferred to less: Adding a better end. Psychological Science, 4(6), 401-405. View source

2. Redelmeier, D. A., & Kahneman, D. (1996). Patients' memories of painful medical treatments: Real-time and retrospective evaluations of two minimally invasive procedures. Pain, 66(1), 3-8. View source

3. Redelmeier, D. A., Katz, J., & Kahneman, D. (2003). Memories of colonoscopy: A randomized trial. Pain, 104(1-2), 187-194. View source

4. Do, A. M., Rupert, A. V., & Wolford, G. (2008). Evaluations of pleasurable experiences: The peak-end rule. Psychonomic Bulletin & Review, 15(1), 96-98. View source

5. Miron-Shatz, T. (2009). Evaluating multiepisode events: Boundary conditions for the peak-end rule. Emotion, 9(2), 206-213. View source

6. Fredrickson, B. L., & Kahneman, D. (1993). Duration neglect in retrospective evaluations of affective episodes. Journal of Personality and Social Psychology, 65(1), 45-55. View source

7. Horwitz, A. G., McCarthy, K., & Sen, S. (2024). A review of the peak-end rule in mental health contexts. Current Opinion in Psychology, 58, 101845. View source