Abstract
A theory of sympathy is advanced, based on the insights of theorists such as Hume, Smith, Cooley, Mead, and Heider, and drawing on modern findings in sociology and social psychology. The process of identifying with another person is determined by the perception of distance from the other, may involve non-conscious imitation, and leads to an enlarged self-interest. The core of the theory is a model balancing physical distance, psychological similarity and familiarity, affection, and evaluation. Great emphasis is placed on the incarnation of social actors, the importance of their bodies and sentiments, and the effects of the interaction order. This theoretical structure is applied to the Prisoners' Dilemma in order to derive a large set of predictions that are tested successfully against the wealth of experimental results.
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