Abstract
1. Using nonimmobilized and nonanesthetized rabbits we have demonstrated prolonged (1 h of more) posttetanic changes in the response of the pyramidal tract (PT) following brief tetanization, close to natural stimulation conditions. 2. The analysis of the changes in the PT response revealed a prolonged potentiation of monosynatic neocortical reactions characterized by low frequency depression and self-restoration 3. Data on the predominant, more marked and prolonged increase in the synaptic component of the PT response indicate that the increase in the efficiency of the excitatory synaptic connections represents the main mechanism of prolonged potentiation. 4. The data obtained on the less prolonged and unstable nature of changes in the D component suggest that a change in the excitability of nerve cells could be only a supplementary mechanism of prolonged potentiation.
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