The peak–end rule is a psychological heuristic in which people judge experiences largely based on how they were at their peak (i.e., their most intense point) and at their end, rather than based on the total sum or average of every moment of the experience. It occurs regardless of whether the experience is pleasant or unpleasant. According to the heuristic, other information aside from that of the peak and end of the experience is not lost, but it is not used. This includes net pleasantness or unpleasantness and how long the experience lasted. The peak–end rule thereby comprises extension neglect and duration neglect.
The peak–end rule is an elaboration on the snapshot model of remembered utility proposed by Barbara Fredrickson and Daniel Kahneman. This model dictates that an event is not judged by the entirety of an experience, but by prototypical moments (or snapshots) as a result of the representativeness heuristic. The remembered value of snapshots dominates the actual value of an experience. Fredrickson and Kahneman theorized that these snapshots are actually the average of the most affectively intense moment of an experience and the feeling experienced at the end. The effects of the duration of an experience upon retrospective evaluation are extremely slight. Fredrickson and Kahneman labeled this phenomenon duration neglect. The peak–end rule is applicable only when an experience has definite beginning and end periods.
Research and examples
A 1993 study titled "When More Pain Is Preferred to Less: Adding a Better End" by Kahneman, Fredrickson, Charles Schreiber, and Donald Redelmeier provided groundbreaking evidence for the peak–end rule. Participants were subjected to two different versions of a single unpleasant experience. The first trial had subjects submerge a hand in 14°C water for 60 seconds. The second trial had subjects submerge the other hand in 14°C water for 60 seconds, but then keep their hand submerged for an additional 30 seconds, during which the temperature was raised to 15°C. Subjects were then offered the option of which trial to repeat. Against the law of temporal monotonicity, subjects were more willing to repeat the second trial, despite a prolonged exposure to uncomfortable temperatures. Kahneman et al. concluded that "subjects chose the long trial simply because they liked the memory of it better than the alternative (or disliked it less)."
Similarly, a 1996 study by Kahneman and Redelmeier assessed patients' appraisals of uncomfortable colonoscopy or lithotripsy procedures and correlated the remembered experience with real-time findings. They found that patients consistently evaluated the discomfort of the experience based on the intensity of pain at the worst (peak) and final (end) moments. This occurred regardless of length or variation in intensity of pain within the procedure.
Another study by Kahneman and Ziv Carmon identified a boundary condition for the peak–end rule. Participants interacted with a computer program that had them wait to be served, while assessing their satisfaction as they were waiting. Kahneman and Carmon found that how participants felt at the final moment of the experience was a good predictor of their responses when they were asked to retrospectively evaluate their experiences. For example, participants who felt very dissatisfied during the much of the experience but were satisfied in the final few seconds (because the waiting line moved faster than expected toward the end) summarized the experience as satisfying. Kahneman and Carmon concluded that real time experiences that are based on expectations are discounted after the fact if those expectations are unfulfilled.
A third study by Kahneman, Redelmeier, and Joel Katz corroborated and expanded upon the discoveries made in the 1996 study. Colonoscopy patients were randomly divided into two groups. One underwent a colonoscopy procedure wherein the scope was left in for three extra minutes, but not moved, creating a sensation that was uncomfortable, but not painful. The other group underwent a typical colonoscopy procedure. Kahneman et al. found that, when asked to retrospectively evaluate their experiences, patients who underwent the longer procedure rated their experience as less unpleasant than patients who underwent the typical procedure. Moreover, the patients in the prolonged discomfort group were far more likely to return for subsequent procedures because a less painful end led them to evaluate the procedure more positively than those who faced a shorter procedure.
Since most consumer interactions have set beginnings and ends, they fit the peak–end model. As a consequence, negative occurrences in any consumer interaction can be counteracted by establishing a firmly positive peak and end. This can be accomplished through playing music customers enjoy, giving out free samples, or paying a clerk to hold the door for patrons as they leave. As Scott Stratten has suggested, "A really great salesperson who helps with an exchange can erase negative experiences along the way. The long wait in line and the bad music in the changing room are forgotten". However, as research by Talya Miron-Shatz suggests, retrospective evaluations of day-long experiences do not appear to follow the peak–end rule, which brings into question the applicability of this rule to approximately day-length consumer–business interactions (such as like hotel stays).
In 2006, a study was carried out at the University of Canterbury in Christchurch, New Zealand, analyzing the implications of the peak–end rule on the perceived happiness experienced on vacations. The study found that participants' remembered overall happiness was approximately predicted by the peak–end rule, although it was actually better predicted by their happiness during the "most memorable or most unusual 24-h period". Still, the duration of a vacation appeared to have negligible effects on remembered happiness. The results of the study could be applied to choosing more economical durations for vacations.
The peak–end rule is particularly salient in regard to medical procedures, since it suggests that it is preferable to have longer procedures that include a period of decreased discomfort than to have shorter procedures. In particular, the rule "suggests that the memory of a painful medical treatment is likely to be less aversive if relief from the pain is gradual than if relief is abrupt". Furthermore, the quality of a remembered procedure can drastically influence medical futures. If people recall necessary but onerous procedures more positively, then they are more likely to return for repeat procedures later in life. However, factoring the effect of the peak–end rule upon evaluations of medical procedures is problematic, since adding a period of decreasing pain to a procedure is still added pain. Even though this certainly yields a better memory of the process, the patient still endures more pain than is strictly necessary. Doctors and patients are forced to confront the choice between objectively less painful forms of treatment and forms of treatment that will be remembered more favorably. Kahneman claims that "it is safe to assume that few patients will agree to expose themselves to pain for the sole purpose of improving a future memory".
Critiques of the peak–end rule typically derive from its conflation of a complex mental evaluation into a simplistic framework. A 2008 study found some support for the peak–end rule, but also found that it was "not an outstandingly good predictor" of remembered experiential value, and that the happiness of the most memorable part of an experience predicted remembered happiness better than did the happiness of the peak or of the end. Additionally, the extreme effect of peaks fades more rapidly over time, causing peaks to be recalled less positively and troughs recalled less negatively over time. Episodic memory endures for only a few weeks; at some point, mental accounting shifts over to semantic memory, leading to potential over-valuation of the "end" and diminished weighting of the peak. Additionally, memories that are available for evaluation may change due to the fading affect associated with memory or differing goals in recall. Goal orientation or initial expectations can also affect the weighting of a peak or an end, causing an end to be over-weighted as the culmination of a goal. Finally, Ariely and Carmon have theorized that evaluations of past events are affected by feelings at the time of evaluation.
- Fredrickson, Barbara L.; Kahneman, Daniel (1993). "Duration neglect in retrospective evaluations of affective episodes.". Journal of Personality and Social Psychology 65 (1): 45–55. doi:10.1037/0022-35184.108.40.206.
- Kahneman, Daniel (2000). "Evaluation by moments, past and future" (PDF). In Kahneman, Daniel; Tversky, Amos. Choices, Values and Frames. Cambridge University Press. p. 693. ISBN 978-0521627498.
- Kahneman, Daniel; Fredrickson, Barbara L.; Schreiber, Charles A.; Redelmeier, Donald A. (1993). "When More Pain Is Preferred to Less: Adding a Better End". Psychological Science 4 (6): 401–405. doi:10.1111/j.1467-9280.1993.tb00589.x.
- Redelmeier, Donald A; Kahneman, Daniel (1996). "Patients' memories of painful medical treatments: real-time and retrospective evaluations of two minimally invasive procedures". Pain 66 (1): 3–8. doi:10.1016/0304-3959(96)02994-6.
- Carmon, Ziv; Kahneman, Daniel (1996). "The Experienced Utility of Queuing: Experience Profiles and Retrospective Evaluations of Simulated Queues" (PDF). (working paper).
- Redelmeier, Donald A; Katz, Joel; Kahneman, Daniel (2003). "Memories of colonoscopy: a randomized trial". Pain 104 (1-2): 187–194. doi:10.1016/S0304-3959(03)00003-4.
- Stratten, Scott; Kramer, Alison (2012). The Book of Business Awesome / The Book of Business UnAwesome. John Wiley & Sons. p. 12. ISBN 978-1-118-31546-0.
- Miron-Shatz, T (2009). "Evaluating multiepisode events: Boundary conditions for the peak-end rule". Emotion 9 (2): 206–13. doi:10.1037/a0015295. PMID 19348533.
- Kemp, Simon; Burt, Christopher D. B.; Furneaux, Laura (2008). "A test of the peak-end rule with extended autobiographical events". Memory & Cognition 36 (1): 132–138. doi:10.3758/MC.36.1.132. PMID 18323069.
- Ariely, Dan; Carmon, Ziv (2000). "Gestalt characteristics of experiences: The defining features of summarized events". Journal of Behavioral Decision Making 13: 191–201. doi:10.1002/(sici)1099-0771(200004/06)13:2<191::aid-bdm330>3.3.co;2-1.
- Kahneman, Daniel (1999). "Objective Happiness". In Kahneman, Daniel; Diener, Edward; Schwarz, Norbert. Well-Being: Foundations of Hedonic Psychology. Russell Sage Foundation. pp. 3–25. ISBN 978-1-61044-325-8.
- Kahneman, Daniel (2000). "Experienced utility and objective happiness: a moment-based approach" (PDF). In Kahneman, Daniel; Tversky, Amos. Choices, Values and Frames. Cambridge University Press. p. 673. ISBN 978-0521627498.
- Ariely, Dan; Carmon, Ziv (2003). "The Sum Reflects only Some of its Parts: A Critical Overview of Research about Summary Assessment of Experiences". In Loewenstein, George; Read, Daniel; Baumeister, Roy. Time & Decision: Economic & Psychological Perspectives on Inter-temporal Choice. Russell Sage Press. pp. 323–350. ISBN 0-87154-549-7.