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A G Gusev

Publications and source records attributed to A G Gusev.

23 records · Page 2Linked to original sources
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[Comparative analysis of the statistical parameters of synaptic transmission of central neurons in the snail Helix lucorum and in the rabbit].

Comparative analysis of the parameters of synaptic transmission in the central synapses of the snail (parietal ganglia) and in the brain of rabbit (hippocamp and sensorymotor cortex) has been made. Both differences and common features were revealed in synaptic organization of these two objects. Functional re-arrangements may alleviate differences between central synapses of the snail and rabbit. It is concluded that evolution of the central nervous system involved mainly the decrease of the effectiveness of separate synapses at the cost of the decrease of the number of quanta of the released transmitter and the increase of the number of various synaptic connections on each neuron.

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[Morphofunctional types of rabbit visual cortex neurons during postnatal ontogeny].

Eight types of unit responses to flashes were singled out in the visual cortex of non-immobilized rabbits, with morphological identification of representatives of each type. Inhibition was predominant in pyramids responses. Two types of non-pyramid neurones were revealed: with an early excitation (reception of afferent impulses) and with a delayed activation (recurrent inhibition). The distribution of responses along the cortical depth confirms the concept of vertical organization in the functional specialization of neurones. In postnatal ontogenesis there occurs the maturation of stellate cells and the substitution of the immature mechanisms of responses (on pyramid neurones) with normal ones (involving all neuronal types).

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[Cross-correlational analysis of the neuronal connections of the cerebellum in the waking rabbit].

The methods of cross-interval and crosscorrelation analysis were used to study interneuronal connections in cerebellar vermis in awake rabbit. Crosscorrelation, or spike-triggering method, complemented the analysis of cross-intervals which estimated the neuronal interaction comparing spike sequences as point processes. Among 16 neuronal pairs recorded intra- or extracellularly 10 pairs were considered as interconnected. Inhibitory interconnections dominated. The inhibitory neuronal interconnections were revealed in pairs with complex spikes. Neurons which constituted pairs with reciprocal excitatory-inhibitory interaction fired only simple spikes. The variability and plasticity of common inputs to Purkinje cells were seemingly lower than those of direct connections which probably transmitted the output signals of Purkinje cells.

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