Outlines of Psychology (1896; English 1897) (Classics in Psychology, 1855-1914)

Wundt's first general textbook of the new psychology and the first appearance of his tridimensional theory of feeling. Arguing that feelings vary not only with regard to pleasantness/ unpleasantness but also with respect to strain/relaxation and excitement/ calm, Wundt stimulated a mass of experimentation that helped define the nature of early psychological science.