Abstract
This chapter describes the theory of psychophysics highlighting the relationship between sensory responses and the antecedent physical stimuli. The main body reviews a comprehensive array of noteworthy data and theories. Psychophysics emphasizes the need for adequate theoretical frameworks to underpin scales derived from magnitude estimation and from different numeric rating processes as well as from discrimination tasks. Magnitude estimation, category rating, and related methods have immensely diversified the stock of psychophysics, thereby helping to develop a massive database for students of both decision processes and sensory processes. Psychophysical scales reflect an amalgamation of sensory and cognitive processes, yielding a rich network of predictable phenomena. The psychophysical function is monotonous; the order of subjective values reproduces the physical order of stimuli. The chapter even explores the ultimate need to integrate scaling data with all the relevant data and theories which are similar to the psychological representation of magnitude. Sensations are hard to measure, not for being mental, subjective, or inaccessible, but simply for want of a good psychophysical theory.
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