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A) Illustrated excitatory postsynaptic currents evoked by a pair of pulses delivered at a 50 ms interval. At many synapses, facilitation increases the amplitude of the second response more than 2-fold.
B) Typical time course of paired-pulse facilitation
C) Illustrated facilitation produced by a 50 Hz train of 10 stimuli
D) Facilitation as a function of stimulus frequency
