Explain the concept of psychophysics. Describe main psychophysical methods.

 Psychophysics, study of quantitative relations between psychological events and physical events or, more specifically, between sensations and the stimuli that produce them.

Physical science permits, at least for some of the senses, accurate measurement on a physical scale of the magnitude of a stimulus. By determining the stimulus magnitude that is just sufficient to produce a sensation (or a response), it is possible to specify the minimum perceptible stimulus, or the absolute stimulus threshold (stimulus limen), for the various senses. The central inquiry of psychophysics pertains to the search for a lawful, quantitative relation between stimulus and sensation for the range of stimuli between these limits.

Psychophysics was established by German scientist and philosopher Gustav Theodor Fechner. He coined the word, developed the fundamental methods, conducted elaborate psychophysical experiments, and began a line of investigation that still persists in experimental psychology. Fechner’s classic book Elemente der Psychophysik ______ ______ _____ _______ _________ _____ __________ __________.
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