How can repeated stimulation cause long-term changes in reflexes?

Repeated stimulation can induce long-term changes in reflexes through the process of neuroplasticity, which involves alterations in the strength and structure of synapses.1

These changes occur because repeated activation of synapses can increase their efficiency, leading to lasting modifications in reflex behavior. For example, in studies involving spinal cord transections, consistent daily stimulation of a specific area can eventually change the latency of a reflex or lead to its extinction. This occurs because the repeated input causes a structural or functional shift in the synaptic connections within the reflex arc.21

Specific mechanisms include:
* Synaptic Efficiency: Repeated stimulation can lead to long-term potentiation, a long-lasting strengthening of the response of a postsynaptic nerve cell.3
* Structural Changes: Long-term effects of plasticity may include changes in the number of active zones at nerve terminals; these zones are often reduced during long-term habituation and increased during long-term sensitization.1

When this repeated stimulation ceases, these synaptic functions may regress, allowing the reflex responses to return to their original form.2