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Memory & Perception
Peak-End Rule
Memory phenomenonDefinition
The tendency to judge an experience based on how you felt at its most intense point (the peak) and at its end, rather than the average of every moment.
Why it happens
Our brains compress long experiences into emotional highlights. The peak and the ending are the most salient moments, so they disproportionately shape our overall evaluation.
Real-life examples
- A vacation remembered fondly because of one amazing day, despite several boring ones.
- A painful medical procedure rated as 'not that bad' because the ending was gentle.
- A great dinner ruined in memory by a rude waiter at checkout.
How to counter it
- When evaluating a past experience, review the full timeline, not just highlights.
- Rate each phase of an experience separately, then average them.
- Design important experiences to end positively.
- Be aware that your summary of an experience may not reflect its entirety.
Quick tips
- Design experiences to end on a high note when possible.
- When evaluating past experiences, review the full timeline, not just highlights.
- Be aware that your memory of an experience may not reflect its totality.
- Use this knowledge to improve how you deliver experiences to others.
Sources and further reading
- Evaluation by Moments: Past and Future
Cambridge University Press