Abstract

Two forms of influence and action are in the program of the Social Psychology of Tarde : The crowds and the actions in the contact on one hand, the public and the actions at distance on the other hand. A public is shape of evolved sociality and association, he bases on the suggestion at distance. What characterizes the crowd of Tarde are the currents which cross her. Bat, in fad, crowd is a shape of the past. Incapable to extend ; she leave the place to the public. One finds a similar vision in Robert Park’s « The Crowd and the Public » where dimension ephemeral collective behaviour; the contagion of ideas, mobilizes the interest of the school of Chicago. Really this group conceives Social Psychology as movement by which sociology frees itself from the homo-economicus Park leans on the theory of the imitation of Tarde to base his interactionnist sociology . The movements which try to reorganize attention arc in fact processes of individualization where the individuals constitutes a state of the social process. Park one american, Tarde ?