[Model system of binaural hearing. III. Binaural processing of information about short sounds]. / Model' sistemy binaural'nogo slukha. III. Binaural'naia obrabotka informatsii o korotkikh zvukakh.

A model of neuronal structures of the medial superior olivary nuclei and inferior colliculus performing the determination of the direction on the source of the short (shorter than 10 ms) sound signals is presented. In the model the difference between the moments of the arrival of the two informational messages formed on the stage of monaural information processing is calculated. The result of this calculation is the firing probability of the primary detector (the neuron of the medial superior olivary nucleus). Because of the internal noise the curve of this probability as a function of the direction on the source is smoothly sloped. The estimation of the direction is the result of the statistical processing of the responses of the primary detectors ensemble. The direction on the source of sound is coded by a position of the secondary detector (the neuron of the inferior colliculus) on the direction "scale".

[Model of a binaural hearing system. II. Monaural processing of information concerning short sounds]. / Model' sistemy binaural'nogo slukha. II. Monaural'naia obrabotka informatsii o korotkikh zvukakh

The first part of the model of the auditory system determining the direction on the source of short (shorter than 10 msec) sound signals is presented. The processes in perceptors, the neurons of spiral ganglion, anterior ventral cochlear nucleus and medial superior olivary nucleus are simulated. According to the model the information about a sound signal has undergone several stages of processing and finally a resultant pulse is formed. The moment when this pulse appears on the input of the comparing neuron (in the medial olive) is determined by the two parameters of the sound: its intensity and the moment when a sound arrives to one of the ears.