Readers frequently ask about the definition of neuromatrix in relation to the brain and pain. Wikipedia and Google are not that helpful (yet), though there are some good links on Google to Ronald Melzack's pioneering work. (Melzack, 1999, 2001).
Cognitive Psychology is merging to some degree with neurobiology. While the term neuromatrix has emerged with the increasing knowledge of brain neuroscience, some of the older cognitive psychology writings provide good definitions and understanding of what we now call the neuromatrix.