When More Pain Is Preferred to Less: Adding a Better End

@article{Kahneman1993WhenMP,
  title={When More Pain Is Preferred to Less: Adding a Better End},
  author={Daniel Kahneman and Barbara L. Fredrickson and Charles A. Schreiber and Donald A. Redelmeier},
  journal={Psychological Science},
  year={1993},
  volume={4},
  pages={401 - 405}
}
Subjects were exposed to two aversive experiences: in the short trial, they immersed one hand in water at 14 °C for 60 s; in the long trial, they immersed the other hand at 14 °C for 60 s, then kept the hand in the water 30 s longer as the temperature of the water was gradually raised to 15 °C, still painful but distinctly less so for most subjects. Subjects were later given a choice of which trial to repeat. A significant majority chose to repeat the long trial, apparently preferring more pain… 

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