[Mechanisms of habituation of the electroexcitable membranes of cortical neurons].

Habituation of the cortical neurone response is attended with change in the membrane excitability generating peak potentials. Excitability of spontaneous AP trigger zones increases non-specifically. This is due to a non-specific depolarization shift of the membrane potential during habituation. Excitability of the trigger zones of AP evoked by a monotonous stimulus, decreases: the depolarization critical level shifts in the positive direction and the threshold potential increases. Excitability of the trigger zones of AP elicited by an extrastimulus, enhances: the depolarization critical level shifts in the negative direction and the threshold potential decreases. Excitability changes of trigger zones of evoked AP during habituation are specific, local, reversible and resulting from changed electrogenic properties of the zones: they are underlying the change in the response of the neurone electrically excitable membrane in the process of habituation.