In recent years the gate control theory of pain' has been reinforced by the:

In recent years the gate control theory of pain' has been reinforced by the:
 
  a. nexus theory of pain', which adds key elements such as meaningful cultural factors and stress regulation that play a role in how the brain processes and synthesises genetic and motor nerve impulses.
  b. neuromatrix theory of pain', which adds key elements such as emotion, cultural factors, stress regulation and immune systems that play a role in how the brain processes and synthesises genetic and sensory nerve impulses.
  c. specificity theory', which adds key elements such as emotion, cultural factors, stress regulation and immune systems that play a role in how the brain processes and synthesises genetic and sensory nerve impulses.
  d. neuromatrix theory', which adds key elements such as meaningful cultural factors and stress regulation that play a role in how the brain processes and synthesises genetic and motor nerve impulses.