The simultaneous arrival of a graded depolarization and a graded hyperpolarization of equal but opposite magnitude at a particular location on the dendritic membrane is likely to cause the apoptosis of the neuron, allow only the entry of sodium ions into the neuron, and prevent potassium ions from exiting the neuron, cause depolarization, because graded depolarizations are more important to neuron function, cause hyperpolarization, because graded hyperpolarizations are more important to neuron function, have no effect, since the depolarization and hyperpolarization will cancel each other out.