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A binaural integration test.

In recent years, disorders involving the central auditory pathways have been investigated using distorted speech material. The methods have included binaural integration tests in which different parts of the same message are presented to the two ears. When investigating the effect of different central pathologies on this integration it is necessary to know the range of variation that can occur in normal subjects.The present study examines the effect of presenting speech to one ear at a level below the threshold of intelligibility, while the same message is presented to the other ear after filtration. A high pass filter is used on the assumption that a message presented to the other ear below the threshold of intelligibility provides mainly low frequency information.The discrimination score for both monosyllabic and sentence material is measured for normal subjects under the conditions: (a) filtered; (b) unfiltered; (c) filtered and unfiltered presented binaurally. The range of increase in discrimination s...