Description:S. S. Stevens' famous paper On the Psychophysical Law, published in 1957, ignited a controversy that continues to this day--how to accurately measure sensation. For example, how can the perception of sensation diverge so sharply from the magnitude of the stimulus? How should it be measured? This book offers a concise but detailed introduction to the issues arising from this controversy. It presents the most important arguments in the field, plus a comprehensive survey of the data to allow readers to form their own opinions on the debate.