Thinking, Fast and Slow · chapter 35 · id thinking-fast-and-slow-c35-01-retrospective-evaluations-of-p

“Retrospective evaluations of painful experiences are determined by the peak intensity and the end, not the total duration (peak-end rule), as shown in the colonoscopy study.”

holdsconfidence: high✓ ZHP-verified + red-teamed

Receipts

Redelmeier & Kahneman (1996), Pain 66(1)DOI registry: valid

154 patients undergoing colonoscopy or lithotripsy reported real-time pain every 60 seconds. Retrospective evaluations were predicted by peak and end intensity but largely insensitive to total duration.

Redelmeier, Katz & Kahneman (2003), PainFLAGGED: DOI not in registry

Patients randomized to longer colonoscopy with less painful ending reported less total discomfort retrospectively, confirming peak-end rule and duration neglect in a controlled setting.

This claim is a stable, citable object. If you can falsify a verdict, tell us — corrections are loud here.