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Minimal excitatory postsynaptic potentials (EPSP) were investigated in 13 neurons under single or double-pulse near-threshold microstimulation of the radial layer (Schaffer's collaterals) and stratum oriens in surviving hippocampal slices (area CA1) in guinea pigs. The amplitude of 23 EPSP (9 units; 12 pathways) rose after tetanization of Schaffer's collaterals over a 5–55 min period, taken as long-term potentiation (LTP). Statistical analysis conducted using four methods of quantal hypothesis based on a binomial approximation revealed an increase in mean quantal content (m) during LTP. The rise in quantal size was only statistically significant when using data obtained from a section of these methods (mainly for stretches of over 15 min following tetanization) and shows no correlation with intensity of LTP. The pronounced rise in m demonstrated using different methods matches data from experiments on intact animals and indicates a presynaptic location of the mechanisms underlying protracted persistence of residual tetanization lasting some tens of minutes.

Quantal analysis of long-term posttetanic changes in minimal postsynaptic potentials of hippocampal slices in vitro