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In page Wide dynamic range neuron:

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WDR neurons differ from most other neurons in that they experience what is called a ‘wind up’. This allows for the intensity of their response to increase with an increased frequency of stimulus.[4] Most other neurons fire repeated action potentials of the same magnitude as a reaction to an increase in stimulus intensity. The intensity of the stimulus will only boost the frequency of action potentials, not their magnitude. However, WDR neurons exhibit increased action potential intensity with more presentations of a stimulus.[4] This allows for plasticity of synapses[4] and creates flexibility in the neuronal response. Though this may be of some benefit to the organism, this over excitation of the neurons can result in chronic pain.[1]