A Neuro-Synaptic Model of Bilateral Interaction in Auditory Nervous System

Kenji ITOH  

IEICE TRANSACTIONS (1976-1990)   Vol.E67   No.1   pp.12-18
Publication Date: 1984/01/25
Online ISSN: 
Print ISSN: 0000-0000
Type of Manuscript: PAPER
Category: Acoustics

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A model of bilateral interaction in the auditory nervous system was presented on the basis of digital-chemical-analog functions of neuro-synaptic circuits in order to analyze the mechanism of cross correlational information processing for sound localization. The system was composed of a bilateral pair of auditory relay nuclei, i.e., cochlear neclei, superior olives, and inferior colliculei as well as a pair of trapezoid bodies which connect contralateral cochlear nucleus and ipsilateral superior olive. The model could detect interaural phase differences using the interaction of excitatory and inhibitory postsynaptic potentials evoked by the respective ipsilateral and contralateral putputs of the cochlear nuclei rather than Bergeijk's or, originally, Békésy's travelling waves on phase detection cells. The two parameters on sound image, lateralization index and probability fusion were introduced as the difference and the sum of the bilateral outputs of superior olives, respectively. The effect of 'phase-intensity trade' as well as 'time-intensity trade' was simulated in the model to compare with the experimental results. Dominancy for binaural information processing was discussed and the possibility of inter- and intra-modal information processing involving temporal operations among analogous postsynaptic potentials from various sensory inputs was suggested.