Psychophysics is a lively account by one of experimental psychology's seminal figures of his lifelong scientific quest for general laws governing human behavior. It is a landmark work that captures the fundamental themes of Steven's experimental research and his vision of what psychophysics and psychology are and can be. The context of this modern classic is detailed by Lawrence Mark's pungent and highly revealing introduction. The search for a general psychophysical law-a mathematical equation relating sensation to stimulus-pervades this work, first published in 1975. Stevens covers methods...