Abstract
Textbook definitions of the psychophysical methods indicate differences of opinion among authors regarding the central issues which differentiate one method from another. Some of the disagreement among authors may be traceable to what is apparently a dichotomous approach involving an emphasis upon methods of gathering data and techniques for analyzing data. It is suggested that definitions center upon the aspects of differential sensitivity, namely, a threshold, a frequency of error, and a magnitude of error, rather than upon the ways in which the data are obtained or analyzed.
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