[The effect of the negative reinforcement system on the nonspecific nociceptive system of the thalamus in 41- to 60-day-old rabbits].

The work has been carried out in two steps. At the first one, in behavioural experiment, "punishment zones" were identified in animals, at the second step, in acute experiment, studies were made of the effect of stimulation of these zones on EP registered in CM-Pf in response to peripheral nociceptive stimulation. It was shown that stimulation of "punishment zones" inhibits the EP at currents lower critical level at which no avoidance reaction could be observed in behavioural experiment. Changes in the amplitude and duration of the EP depend on the aversive reaction to stimulation of these zones in the behavioural experiment. The sensitivity of CM-Pf to electrical stimulation of "punishment zones" remains constant with age.