[Prolonged potentiation of responses of the neocortex of the intact brain and in vitro cortical slices].

The field potentials (FPs) and neuronal responses evoked by stimulation of subcortical white matter were recorded in the sensorimotor cortex of intact brain in alert rabbits and in cortical slices. After a few short (500 msec) tetanizations (200 Hz) delivered via the stimulating electrodes, a long-term (several hours) increase of short-latency (1-3 msec) FP amplitude occurred in the brain as well as an increase of the same FP components in cortical slices. The probability of short-latency (up to 1.

[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.

[Elementary polysynaptic potentials of hippocampal neurons].

Synaptic connections of 26 pairs of hippocampal neurons were studied in nonanesthetized rabbits by spike-triggered averaging of intracellularly recorded activity. Synchronized activity was detected in 5 pairs and considered to represent common inputs to the neurons recorded. Hyperpolarizing or depolarizing potentials with 3--4 ms latency were revealed in 3 additional pairs.

[Structure of the theoretical distributions of postsynaptic potential amplitudes upon quantum analysis].

It is suggested that formulas commonly used to calculate theoretical amplitude distributions of postsynaptic potentials (PSPs) for their further quantum analysis lead to the overestimation of the quantum value variations (sigma nu) and neglect the variations of a noise level (sigma 2n). A proper formula taking into account both parameters in proposed. The necessity to consider sigma 2n is shown by statistical analysis of "individual" and "minimal" PSPs recorded in the neurons of the central ganglion of the snail and hippocampal neurons of the rabbit.