Results for 'TFT'

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  1. Spatialization and Greater Generosity in the Stochastic Prisoner's Dilemma.Patrick Grim - 1996 - Biosystems 37:3-17.
    The iterated Prisoners Dilemma has become the standard model for the evolution of cooperative behavior within a community of egoistic agents, frequently cited for implications in (...)both sociology and biology. Due primarily to the work of Axelrod (1980a, 198Ob, 1984, 1985), a strategy of tit for tat (TFT) has established a reputation as being particularly robust. Nowak and Sigmund (1992) have shown, however, that in a world of stochastic error or imperfect communication, it is not TFT that finally triumphs in an ecological model based on population percentages (Axelrod and Hamilton 1981), butgenerous tit for tat’ (GTFT), which repays cooperation with a probability of cooperation approaching 1 but forgives defection with a probability of l/3. In this paper, we consider a spatialized instantiation of the stochastic Prisoners Dilemma, using two-dimensional cellular automata (Wolfram, 1984, 1986; Gutowitz, 1990) to model the spatial dynamics of populations of competing strategies. The surprising result is that in the spatial model it is not GIFT but still more generous strategies that are favored. The optimal strategy within this spatial ecology appears to be a form ofbending over backwards’, which returns cooperation for defection with a probability of 2/3 - a rate twice as generous as GTFT. (shrink)
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  2. ACUPOINT STIMULATION IN TREATING PSYCHOLOGICAL DISORDERS: EVIDENCE OF EFFICACY.Indrasen Poola - 2017 - American Psychological Association 1.
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