For this study we used a continuous, iterated, … (two-person) Prisoner's Dilemma. … There is a strong temptation to behave selfishly … [both] behave selfishly. … [p.472] During the course of the game, subjects … no communication, text-chat, [text-to- speech] and … speakerphone … The other player's [points] … was kept hidden until both finished. … [p. 473] Dyads in the voice condition showed the … [9.4 points out of 10]. … Dyads also tended to be more cooperative in … [text-to-speech] … [8.4] … [6.4] and no communication condition [5.3]. [Overall, the type of communication was statically significant at p<0.04, ANOVA].
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