3. asked game theory experts to submit computer programs designed to prevail in game providing rewards either for refusing to cooperate or for cooperating when the programs encountered other programs
9. if tit for tat had been tossed into the game with 49 steadfast non-cooperators, there would have been a 49-way tie for first place Robert Wright, The Moral Animal
10. Most of Tit for Tat’s neighbors were designed to cooperate under at least some circumstances
11. We are designed to cooperate under at least some circumstances
12. When volunteers playing the Prisoner’s Dilemma Game cooperated with one another, the “reward circuits” of their brains were activated, the same regions that are activated when certain drugs are taken or when good fortune befalls us Emory University Professor Gregory Berns .
13. How Do You Play Tit for Tat? Cooperate Retaliate for Betrayal Forgive Return to Cooperation