Induction of long-term plasticity by intracellular tetanization. A, Scheme of intracellular tetanization protocol. Intracellular tetanization consisted of the same postsynaptic firing as pairing: three trains (1/min) of 10 bursts (1 Hz) of five pulses (5 ms, 100 Hz, 0.4–1.5 nA) through the recording electrode. However, no inputs were stimulated during the intracellular tetanization. B, Examples of potentiation, no changes, and depression induced by intracellular tetanization. Same conventions as in Figure 1.