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Proposed mechanisms for coincidence detection in the auditory brainstem

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Abstract

Sound localization in mammals uses two distinct neural circuits, one for low- and one for high-frequency bands. Recent experiments call for revision of the theory explaining how the direction of incoming sound is calculated. We propose such a revised theory. Our theory is based on probabilistic spiking and probabilistic delay of spikes from both sides. We have applied the mechanism originally proposed as an operation on spike trains resulting in multiplication of firing rates. We have adapted this mechanism for the case of synchronous spike trains. The mechanism has to detect spikes from both sides within a short time window. Therefore, in both circuits neurons act as coincidence detectors. In the excitatory low-frequency circuit we call the mechanism the excitatory coincidence detection, to distinguish it from the mechanism of the inhibitory coincidence detection in the high-frequency circuit. The times to first spike and gains of the two mechanisms are calculated. We show how the output gains of the mechanisms predict the dip within the human frequency sensitivity range. This dip has been described in human psychophysical experiments.

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Authors and Affiliations

  1. Department of Pathological Physiology, Charles University Prague, U nemocnice 5, Praha 2, CZ-128 53, The Czech Republic

    Petr Marsalek

  2. Institute of Physiology, Academy of Sciences of the Czech Republic, Vídeňská 1083, Praha 4, CZ-142 20, The Czech Republic

    Petr Lansky

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  1. Petr Marsalek
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  2. Petr Lansky
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Correspondence to Petr Marsalek.

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Marsalek, P., Lansky, P. Proposed mechanisms for coincidence detection in the auditory brainstem. Biol Cybern 92, 445–451 (2005). https://doi.org/10.1007/s00422-005-0571-1

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  • DOI: https://doi.org/10.1007/s00422-005-0571-1

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