[Influence of cortexin on memory and attention].

The authors present the review of works devoted to one of peptide bioregulators (the biologically active agent) known as cortexin, which is used in memory and attention recovery. The cerebral cortex drug cortexin was created in Military Medical Academy in 1986. The cortexin favourable effect on cerebral mnestic and cognitive functions in different patient groups was noted.

[The current concepts of the nature and functions of sleep].

The paper presents a review of current papers concerning the functional significance of sleep in the whole and of its phases. A new hypothesis is proposed according to which the main sleep functions are body energy conservation and saving of plastic substances. The author reasons that the healthy human brain and the animal brain all the more do not become tired under low and moderate mental and physical loading in the day-time and, therefore, do not need sleep as rest.

[The phenomenon of the functional dissolution of the wakefulness-sleep cycle in white rats under the influence of immobilization].

Studies have been made on functional dissolution of the sleep cycle in albino rats due to immobilization of various duration. It was shown that 1-day immobilization increases microactivational representation in the EEG, facilitates rhythmic movements of the lower jaw, affects relative duration of the diurnal and nocturnal sleep, increases sleep fragmentation, and in some of the animals decreases the EEG amplitude. It is suggested that strong stress results in the return of sleep mechanisms to a more ancient level.

[The wakefulness-sleep cycle in rats with a genetic predisposition to catalepsy].

Neurophysiological studies on wakefulness-sleep cycle have been made in rats selected for hereditary inclination to catalepsy. It was shown that in these animals, the stage of delta-sleep is significantly reduced, whereas the duration of a superficial slow-wave sleep is increased. In a sleeping phase of the cycle, large amount of spindles in the range of alpha- and beta 1-oscillations was observed, especially significant in electrograms of n.