This is the second edition of a 1980 publication, in which contributors explored theory and history by focusing on some of the central figures in the development of the discipline. Chapters focus on psychophysics (the oldest incarnation of experimental psychology) and on Gestalt, cognitive and evolutionary psychology. This text is considerably updated and expanded, covering such seminal influences as Fechner, G.E. Muller, Wundt, Galton, James, Darwin,...