On the Relation of the Methods of Just Perceptible Differences and Constant Stimuli (Classic Reprint) - Softcover
Synopsis
Excerpt from On the Relation of the Methods of Just Perceptible Differences and Constant Stimuli
Psychophysics has evolved a number of procedures by means of which the sensitivity of a subject can be determined. These procedures differ widely as to the experimental arrangement which they require and as to the calculation to which the results are subjected, but they have the common purpose of measuring the sensitivity of the subject. We may say, in general, that a psychophysical method is a prescription for the collecting of data and their evaluation in such a way that the result enables us to compare the sensitivity of different subjects, or of the same subject under different conditions or at different times. All these methods agree in this one point, that by them we undertake to give measures of sensitivity. The quantities which are used as the measures of sensitivity are widely different and, perhaps, not always directly comparable. One is confronted with the situation that the comparison of the sensitivity of different subjects by a given method yields perfectly satisfactory results, but that these results do not always agree with those obtained by other methods. One is then led to ask, what the relation of these different meas ures of sensitivity may be. This problem is frequently stated in the form of the question of the relation of the method of con stant stimuli and the method of just perceptible differences.
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