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Comparison of the longevity of LTP induced by 400 versus 250 Hz stimulation in rats. The graphs illustrate average amplitude of the field EPSP and population spike before and after delivery of 3 × 10 trains at 400 hz (n = 4 rats) and six 250-hz trains (n = 6 rats). Both stimulation paradigms produce stable LTP that persists for the duration of the experiment (over 3 h).
