The effect of spatial separation on the ability of subjects to hear both sounds in a pair of concurrent broadband sounds presented in virtual auditory space was examined. Results suggested that this ability relied strongly on differences in the binaural cues delivered by the sounds, and stimulus pairs could not be separated if they delivered the same binaural cues. A relatively simple model was developed to explain these data using a combination of computational tools relevant to auditory processing: (a) a 128-channel cochlea model, (b) spike generation representing the temporal structure of the energy in each channel, (c) within-channel cross-correlation of left and right ear spike patterns, (d) exclusion of low-energy channels and (e) aggregation of cross-correlation results over remaining channels.
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