The short time after a neuron has fired where it is impossible to elicit another action potential. This is because voltage-gated Na+ ion channels are unresponsive at this time. 

Brandeis University

California Polytechnic State University, San Luis Obispo

The period of time immediately following an action potential during which a neuron's responsiveness to subsequent stimulation is either completely absent or significantly reduced.

Refractory Phase

Breedlove, S. & Watson, N. (2017). Behavioral neuroscience, eighth edition. Oxford University Press.

Behavioral Neuroscience 8th Edition

Absolute Refractory Phase

The time after the absolute refractory phase where only a much stronger stimulation can spark another action potential. This is due to the hyperpolarization that occurs following an action potential.

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