On the Sensory Discrimination of Intensities

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Abstract
Recognition of the statistical character of the just detectable increment of intensity of light ([DELTA]i ) permits calculation of [DELTA]I=(I 2[long dash]I 1)from suitable data upon other visual functions. The quantitative agreement between the properties of [DELTA]I thus calculated and as detd. directly (expts. on bees) requires that the law of effect (sensory intensity) as a function of stimulating intensity be dealt with as a band which measures the probability of occurrence of the index response.

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