[Periodic phenomenon in the ECoG of newborn rat pups and its correlation with spontaneous motor activity].

In conscious 2-6-day rat puppies, studies have been made on the bioelectrical activity in the visual and sensorimotor cortex. ECG in newborn rat puppies exhibits characteristic intermittence of complexes of the electrical activity with intervals of partial or almost complete absence of the activity in a minute scale. This phenomenon reflects the ancient property of immature nervous system, i.e. a capacity to autogenic periodic excitation. The structure of these complexes may be different, since it reflects the condition of animals at the given moment, the degree of maturation of elements involved in realization of the bioelectrical activity and interrelationship with other parts of the brain. With respect to amplitude-frequency parameters, age dynamics and the relationship to the spontaneous motor activity, four distinct types of complexes were revealed in the ECG of rat puppies during the first week of their postnatal life.