Lateralization model and the role of time-intensity tradings in binaural masking: Can the data be explained by a time-only hypothesis?

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Abstract
A lateralization model of binaural masking-level differences (MLD), according to which detection under conditions which produce an MLD is based on the average value of an interaural parameter, .DELTA., was previously presented. This factor is made up of interaural time (.DELTA.t) plus interaural intensity (.DELTA.I) weighted by a binaural trading ratio (TR). The previously presented figures depicted application of the model to MLD found as a function of frequency; those figures were partially incorrect. They showed the lateralization equation with a time-intensity trading ratio of 20 .mu.sec/dB to be the best fit, but the fit to TR = 0 .mu.sec/dB is excellent. The lateralization model with a trading ratio of 0 is very much like the vector model of Webster and also Jeffress et al. Variability in the noise process may be a significant factor, allosing binaural neurons tuned to high frequencies to recover and then respond again to interaural differences of time [in humans].

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