Binaural Lateralization of Cophasic and Antiphasic Clicks

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Abstract
Results from a computational model for middle-ear and basilar-membrane operation suggested several binaural phenomena. The effects were sought experimentally in tests on the binaural lateralization of pulses. The interaural times for producing centered images were measured as functions of pulse polarity and noise masking. To a large extent, the interaural disparities appear explicable in terms of mechanical response of the basilar membrane together with simple hypotheses about the mechanical-to-neural transduction in the inner ear. The time disparity can be manipulated by symmetrically masking with high-pass or low-pass noise. By this means, the coherent neural information is elicited from a restricted place on the membrane and reflects the mechanical properties of that place. Similarly, asymmetrical masking yields interaural times that reflect the transit times to specific membrane places. Calculations from the mathematical model for the middle ear and basilar membrane were used to interpret the psychoacoustic behavior in terms of physiological response.

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