Sound localization at high frequencies and across the frequency range

Abstract Mammal sound localization uses two distinct neural circuits, one for low and the other for high frequency. We explain why the coincidence detection at the neuronal level is used in both pathways. Our description is based on probabilistic spiking and timing jitter. We propose a new inhibitory coincidence detection mechanism for the inhibitory part in the high-frequency pathway. Output firing and gain of the two mechanisms is calculated. We show how the output gains of the mechanisms predict the notch within the frequency-sensitivity range. This notch was described in human psychophysical experiments.

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