The ecology and evolution of patience in two New World monkeys

Jeffrey R. Stevens, Elizabeth V. Hallinan, Marc D. Hauser

Research output: Contribution to journalArticlepeer-review

183 Scopus citations


Decision making often involves choosing between small, short-term rewards and large, long-term rewards. All animals, humans included, discount future rewards-the present value of delayed rewards is viewed as less than the value of immediate rewards. Despite its ubiquity, there exists considerable but unexplained variation between species in their capacity to wait for rewards-that is, to exert patience or self-control. Using two closely related primates-common marmosets (Callithrix jacchus) and cotton-top tamarins (Saguinus oedipus)-we uncover a variable that may explain differences in how species discount future rewards. Both species faced a self-control paradigm in which individuals chose between taking an immediate small reward and waiting a variable amount of time for a large reward. Under these conditions, marmosets waited significantly longer for food than tamarins. This difference cannot be explained by life history, social behaviour or brain size. It can, however, be explained by feeding ecology: marmosets rely on gum, a food product acquired by waiting for exudate to flow from trees, whereas tamarins feed on insects, a food product requiring impulsive action. Foraging ecology, therefore, may provide a selective pressure for the evolution of self-control.

Original languageEnglish (US)
Pages (from-to)223-226
Number of pages4
JournalBiology Letters
Issue number2
StatePublished - Jun 22 2005
Externally publishedYes


  • Impulsivity
  • Marmosets
  • Rate maximization
  • Tamarins
  • Temporal discounting

ASJC Scopus subject areas

  • Agricultural and Biological Sciences (miscellaneous)
  • Agricultural and Biological Sciences(all)


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