Specificity Theory of Pain
One of the earliest theories of pain was specificity theory. Specificity theory argued that the body has a separate sensory system for perceiving pain - just as it does for hearing and vision - and this system contains its own special receptors for detecting pain stimuli, its own peripheral nerves and pathway to the brain, and its own area of the Brain for processing pain signals. When a noxious event stimulates a pain receptor, a signal travels to the pain centre in the brain.
