According to the gate control theory of pain, processes in the spinal cord process and modify pain sensations.
The spinal cord is said to have a neurological "gate" that either shuts off or permits pain signals to reach the brain, according to the "gate control" theory. Both concerns with phantom and chronic pain are frequently explained by this notion.
Unlike a genuine gate, which opens and closes to let everything pass through, the gate in the spinal cord makes distinctions between various fiber types while sending pain messages. Specifically, impulses sent by large nerve fibers are inhibited while those sent by small nerve fibers are allowed to flow.
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