Volume 29 #1

Contents

1. To the problem of neuronal firing correlation between neurons located in the auditory pathway (Analitic review)
2. Wiring of retinal direction-selective ganglion cells. Review
3. Recognition of projectively transformed planar figures. VIII. On computation of the ensemble of correspondence for “rotationally symmetric” ovals
4. The differences in the neuronal metabolic activity in eye-specific layers of the dorsal lateral geniculate nucleus in cats with altered binocular vision
5. The influence of masker on the hearing sensitivity to the dynamic changes in sound spectrum depending on masker-to-signal intensity ratio
6. Sensitivity of various areas of the head of a beluga to acoustical stimulation: Checking the hypotheses of sound conduction in odontocetes
7. Biosensor test-system for determination of the physiological heparin concentrations

The state-of-the-art review of the literature concerning the interaction of the neurons located in close proximity to each other along neuronal auditory pathway is presented. The current data support the independence of the moments of the spike appearance in the auditory nerve fibers, even which are connected with single inner hair cell. Mechanisms to ensure this independence are discussed. There is every reason to believe that the independence of firing is maintained in the ventral cochlear nucleus. The interdependence of temporal patterns of impulses in closely spaced neurons located in inferior colliculus yet explores insufficiently. However, there are some reasons to believe that in the central nucleus of the inferior colliculus that independence is still present. In the structures surrounding the central nucleus, those usually doesn’t included in the direct auditory pathway, the interdependence of neighboring neurons impulsation becomes quite pronounced. In the medial geniculate body the weakest functional interneuronal connection corresponds to the ventral part of the nucleus which is the part of direct auditory pathway. Finally, for the primary sensory cortical projection zones differences in the degree of interdependence of impulses of neurons in layers of the cortex have been observed. The most independent firing takes place in cells which receiving the signals directly from the thalamic sensory nuclei. These data suggest that in the direct auditory pathway all temporal information is effectively used with the minimum of redundancy. This allows the most detailed analysis of the time course of the sound signals in a wide range of frequencies and intensities. In brain regions associated with the synthesis and classification of complex auditory signals, the correlation between neurons becomes more pronounced.

Key words: correlation, spontaneous activity, single neurons, the auditory pathway, independence, analysis of auditory images

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