When the potential of a neuron is made more negative (e.g., moved from -70 to -73 millivolts), the neuron has experienced a depolarization.

Name: When the potential of a neuron is made more negative (e.g., moved from -70 to -73 millivolts), the neuron has experienced a depolarization.
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When the potential of a neuron is made more negative, it is experiencing hyperpolarization, not depolarization. Depolarization would involve the potential becoming less negative (e.g., moving from -70 to -67 millivolts).

When the Potential of a Neuron Is Made More Negative