Binaural summation- a century of investigation.

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Abstract
This is a review of the expts. of the last 100 years relating to binaural summation. A sound is heard more easily and, once heard, seems louder, when an observer uses 2 ears than when he uses only one. The difference in loud-ness between a tone heard monaurally and a tone heard bin-aurally varies with intensity. The difference between the bin-aural and monaural threshold varies as a function of the fre-quency of the tonal stimulus and as a function of the level of a background noise against which stimuli are presented. Current explanations based on analogy to mechanical or electrical systems are inadequate. The physiological bases of the phenomena are not known.

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