Fig. 1. Recording and stimulation in CA1 of the mouse hippocampus. The diagram shows the experimental arrangement in the CA1 area of the hippocampal slice preparation. Two bundles of afferent fibers converging to the dendrites of a common population of neurons are stimulated electrically (S1 and S2). Activation of S1–S2 evoked synaptic events restricted to the input. EPSC = excitatory postsynaptic current; fEPSP = field excitatory postsynaptic potential.