[The ontogenetic characteristics of the effect of stimulating the "reward zones" on the evoked potential in the parafascicular complex of the rabbit].

In experiments on 24 anaesthetized 30-40-days rabbits, studies have been made of the effect of stimulation of the "reward zones" on the evoked potentials in the parafascicular complex in response to nociceptive stimulation of the hindlimb. It was shown that the effect of depression depends on the strength and duration of stimulation, being more evident in animals with a strong reaction to self-stimulation. A comparison was made of analgetic effects produced by stimulation of the reward zones in various brain structures (the anterior, median and posterior lateral hypothalamus, the capsula interna, subthalamic region, etc.). Original description is presented of ontogenetic peculiarities of the recovery period for the evoked potentials after cessation of stimulation. The data obtained are discussed in relation to functional properties of nonspecific thalamic system of rabbits at the given stage of their development.