Acclimatisation (neurons)
Acclimatisation is the process by which the nervous system fails to respond to a stimulus, as a result of the repeated stimulation of a transmission across a synapse. Acclimatisation is believed to occur when the synaptic knob of the presynaptic neuron runs out of vesicles containing neurotransmitters due to overuse over a short period of time.
Source: Wikipedia — Acclimatisation (neurons) (CC BY-SA 4.0)