An excitatory postsynaptic potential (EPSP)
a) depolarizes a neuron, increasing the likelihood of an action potential.
b) hyperpolarizes a neuron, decreasing the likelihood of an action potential.
c) hyperpolarizes a neuron, increasing the likelihood of an action potential.
d) depolarizes a neuron, decreasing the likelihood of an action potential.
Explanation: If it is an EPSP, it increases the likelihood of an action potential. Therefore only A and C make sense. To fire an action potential, the neuron has to depolarize; therefore A is the correct answer.
