What Is the Peak-End Rule? Why We Remember the Best (and Worst) Moments

You can have a lovely week away, and a delayed flight home leaves you describing it as “a nightmare.” You can sit through an hour of a mediocre film, and a brilliant last scene sends you out raving.

Our memory does not keep a tidy running average of how things felt. It keeps a snapshot, and that snapshot is built mostly from two things: the most intense moment, and the ending. Psychologists call this the peak-end rule.

What is the peak-end rule?

The peak-end rule is a mental shortcut in which we evaluate a past experience mainly by how we felt at its peak (its most intense point, positive or negative) and at its end, rather than by the sum or average of every moment. It is a close relative of other shortcuts, such as the availability heuristic, in which what comes to mind most easily shapes our judgement.

The research behind it

The cold-water experiment

In a famous 1993 study, Daniel Kahneman and colleagues asked volunteers to hold a hand in painfully cold water in two trials. In the short trial, the hand stayed in cold water for 60 seconds. In the long trial, it stayed for 90 seconds, but during the last 30 seconds the water was warmed slightly, still uncomfortable but less so. Afterwards, participants were offered a choice of which trial to repeat. Most chose the longer one, which contained more total pain, because its ending felt better.

Duration neglect

Barbara Fredrickson and Kahneman’s related work showed that the length of an episode has very little influence on how people evaluate it afterwards. They called this duration neglect. A short, intense unpleasant episode and a long, mild one can be remembered as equally bad, depending on peak and end.

Medical procedures

Donald Redelmeier and Kahneman followed patients undergoing colonoscopy. Patients’ retrospective ratings of pain were predicted by the worst moment and the final moments, not by how long the procedure lasted. In a later experiment, adding a few minutes of milder discomfort at the end of a procedure made patients rate the whole experience as less unpleasant and made them more willing to return.

How strong is the evidence?

A recent meta-analysis of the peak-end rule and duration neglect, which pooled many studies, found that the effect is real and fairly large for peak and end moments. As with most psychological findings, it varies with context, and the result is stronger for intense, emotional experiences than for trivial ones.

Why does it happen?

• Intensity gets remembered. Emotionally powerful moments are encoded more strongly than neutral ones. This overlaps with negativity bias, which makes bad moments loom large.
• Recency. The end of an episode is freshest in memory, so it carries extra weight.
• Memory is reconstructed. We do not replay an experience, we rebuild it from a few vivid anchors. See how memory rebuilds the past.
• Efficiency. Storing a full record of every moment would be costly. Peaks and ends are a compact summary.

Examples in everyday life

• Holidays: a rainy final day can colour a week of sunshine, while a great last dinner can lift a patchy trip.
• Hospitals and clinics: patients remember how a visit ended, such as being rushed out, more than the waiting time earlier.
• Customer service: a company that fixes a problem warmly at the end of a call can win back goodwill, while a rude sign-off can ruin an otherwise fine experience.
• Work projects: a stressful final week or a messy handover can shape how a whole project is remembered.
• Relationships: how an argument ends, with repair or with silence, may matter more to later memory than the heated middle.
• Education and training: a strong final session leaves participants with a better overall impression.

How to use the peak-end rule

1. Design a good ending

Close experiences on a high note. End a meeting with a clear win or thanks, a party with a favourite song or a trip with a special last meal. For difficult tasks, finish with something easier or pleasant.

2. Create a deliberate peak

One standout moment, a surprise, a ritual or a really enjoyable activity, can lift the memory of the whole. In planning a holiday, aim for one or two memorable highlights instead of a perfectly even schedule.

3. Do not let a rough ending overwrite a good whole

After a mostly good day with a bad finish, deliberately recall the earlier moments. Writing down three good things from the day can help balance the snapshot. See how to stop being so negative for related habits.

4. Repair endings in relationships

After a disagreement, take time to reconnect, with an apology, a kind word or a shared cup of tea, so that the ending is repair, not silence. See how to apologize to your partner.

5. Use it ethically

The rule can be used to improve experiences, but not to hide problems. A pleasant ending does not remove the need to fix what went wrong in the middle.

6. Remember the limits

Do not mistake a memory’s verdict for the whole truth. If a decision depends on how something went, look at notes and records, not only your impression.

A worked example

Hana organises a two-day team workshop. Day one goes well, day two has a long, tiring afternoon, and the final session is rushed.

• The risk: people will remember the exhausting afternoon (the low peak) and the hurried finish.
• Fix the end: she cuts one afternoon session and ends with a short round of thanks and one concrete decision from the team.
• Create a peak: she adds a short, fun team challenge in the morning.
• Lift the memory: the closing email lists three achievements from the two days.

In the feedback survey, participants rate the workshop higher than a similar one the year before, even though the content was almost the same.

Common mistakes

• Assuming length does not matter at all. Duration neglect is a tendency, not an absolute rule.
• Using a nice ending to cover real problems. Fix the middle too.
• Ignoring the peak. A single awful moment can dominate.
• Overplanning highlights. Forced excitement can backfire.
• Treating the memory as the facts. Check records if accuracy matters.

Frequently asked questions

What is the peak-end rule in simple terms?

We judge an experience mostly by its most intense moment and how it ended, not by the average of everything.

Who discovered the peak-end rule?

Daniel Kahneman, Barbara Fredrickson and colleagues, in experiments in the early 1990s.

What is duration neglect?

The tendency for the length of an experience to have little effect on how we remember it.

Does the peak-end rule apply to good experiences too?

Yes. A great peak and a happy ending can make a whole experience feel better in memory.

How can I use the peak-end rule?

Plan a good ending, include one memorable high point and avoid letting a rough finish overwrite a good experience.

Is the peak-end rule always true?

No. It is a robust tendency, but it varies with the type of experience, the person and the context.

The bottom line

We remember experiences by their peaks and their endings, not their averages. You cannot redo the middle of a day, but you can end it well, create one good moment and recall the rest honestly. Memory is a snapshot, and you have more say over the last frame than you think.