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When two excitatory postsynaptic potentials (EPSPs) occur at a single synapse so rapidly in succession that the postsynaptic neuron's membrane potential has not returned to the resting potential before the second EPSP arrives, the EPSPs add together producing _____.
A)an action potential with an abnormally high peak of depolarization
B)temporal summation
C)the refractory state
D)spatial summation
E)tetanus