David Bourget (Western Ontario)
David Chalmers (ANU, NYU)
Rafael De Clercq
Jack Alan Reynolds
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Brain and Mind 1 (2):155-179 (2000)
Pains that persist long after damaged tissue hasrecovered remain a perplexing phenomenon. Theseso-called chronic pains serve no useful function foran organism and, given its disabling effects, mighteven be considered maladaptive. However, a remarkablesimilarity exists between the neural bases thatunderlie the hallmark symptoms of chronic pain andthose that subserve learning and memory. Bothphenomena, wind-up in the pain literature andlong-term potentiation (LTP) in the learning andmemory literature, are forms of neuroplasticity inwhich increased neural activity leads to a longlasting increase in the excitability of neuronsthrough structural modifications at pre- andpost-synaptic sites. Moreover, the synapticmodifications of wind-up and LTP share a commonmechanism: a glutamate N -methyl-D-aspartate(NMDA) receptor interaction that initiates a calciummediated biochemical cascade that ultimately enhancessignal processing at the -amino-3-hydroxy-5-methyl-4-isoxazoleproprionic acid (AMPA) receptor. This paper arguesthat chronic pain, which has no adaptive value, canbe accounted for in terms of the highly adaptivephenomenon of activity-dependent neural plasticity;hence, some cases of chronic pain can beconceptualized as a memory trace in spinal neurons.
|Keywords||acupuncture chronic pain evolutionary psychology long-term potentiation long-term depression neuroplasticity nociception phantom pain TENS wind-up|
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