Abstract
Seventy-two males and 72 females played a prisoner’s dilemma game, modified to include occasional promises to the S stating that he would be given extra points if he cooperated on the next trial. The probability and magnitude of promised reward and the overall cooperativeness of the promisor were manipulated. Females cooperated more and evaluated the promisor more favorably than did males. It was concluded that the norm of reciprocity overrode the effects of the manipulations on compliance for the reason that the promisor was unconditionally accommodative on the promise trials. An indirect relationship between ratings of the promisor’s potency and his rewardingness was obtained.
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