Question

activity of neurons in the spinothalamic pathway may still send signals even if the first order sensory receptor does not receive a signal. this situation might cause
referred pain.
phantom limb pain.
pain adaptation.
paraplegia.
anesthesia.

Explanation:

• Referred pain is when pain is perceived in a region distant from the actual source.
• Phantom limb pain occurs when pain is felt in a limb that has been amputated. Here, even without the first - order sensory receptor (the limb in case of phantom limb) sending a signal, the neurons in the spinothalamic pathway (which is involved in pain perception) can still be active.
• Pain adaptation is a decrease in pain perception over time with continuous stimulation.
• Paraplegia is paralysis of the lower body.
• Anesthesia is a loss of sensation.

Answer:

phantom limb pain.