120 subjects played a six-choice Prisoner's Dilemma game in which a simulated other employed either GRIT or GRIT/Tit-For-Tat with varying levels of communication. Analysis indicated that the addition of Tit-For-Tat to GRIT offers no advantages over the standard GRIT strategy.
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PatchenM. (1987) Strategies for eliciting cooperation from an adversary: Laboratory and international findings. Journal of Conflict Resolution, 31, 164–185.
