The Pattern of the Threshold of Perception for Hearing and Other Special Senses as a Function of Age

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Abstract
An analysis of pure tone thresholds of hearing as a function of age shows that these exhibit an exponential decrement when the intensity of the threshold stimulus is expressed on a psychological magnitude scale. Examination of available data indicates that the thresholds of perception of other sense modalities exhibit this exponential decrement with age. There therefore appears to be what might be termed a fundamental presby-psychic law. Evidence is adduced to support a contention that these threshold changes are possibly primarily attributable to degenerative changes in the central nervous system instead of peripherally in the end organs.