Table S6.

Measuring motivations

Response*NonCConCHumCUnc.Total
Myself11155536
Other people12003
Everyone171413
The group081211
More than others10001
None of the above14038
Total153671472
  • Responses chosen from a multiple-choice question asking “What was your most important motivation in the games with real people? Please select the answer that best describes your motivations.” NonC, noncooperator; ConC, conditional cooperator; HumC, humped cooperator; Unc., unclassified.

  • * Full answers available were as follows: “Making myself the maximum money possible”; “Making other people the maximum money possible”; “Making everyone the maximum money possible”; “Making the group the maximum money possible”; “Making myself more money than other people”; and “Other.”