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<p>Underlying vision, audition, and other sense perceptions, is a fundamental quantitative relation between stimulus and sensation, between the objective and the subjective. From this fundamental relation, once established, may be derived another relation giving the least perceptible increment to the stimulus in terms of the whole. Fechner's law is such a relation derived from experimental data. It states that the least perceptible increment is proportional to the whole stimulus over quite a wide range of moderate intensities. That is, the ratio of least perceptible increment to total stimulus is a constant. This constant is shown by experiment to be of the order of 2 per cent. Now, just at the threshold value of a stimulus, evidently the least perceptible
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<br>Subjects: measurements and use of instruments; physics; vision; General Physics</div>
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