Differential Sensitivity in Sound Localization

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Abstract
Binaural localization of sound is a case where a unitary measurable response can be dealt with in its functional relationship with the determining physical factors. When 2 ears are stimulated by equal energies at a frequency of 800 cycles the apparent sound is localized in the median plane of the head. When the increments of energy necessary to cause a just noticeable shift of the localization of the apparent sound from the median plane are determined for a wide range of energy levels, the ratio [DELTA]I/I 1 is found to be large for low levels of energy, small for intermediate levels and to increase for very high energy levels. When the ratio [DELTA]I/I 1 is plotted against log I 1 the resulting curve is of the type which commonly describes differential intensity sensitivity.

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