Individuals who experience low back pain (LBP) for 6 months or more (‘chronic LBP’) display cortical activity and organisation of the primary sensory (S1) and motor (M1) cortices that differs from pain-free individuals.58,61,66 For example, studies demonstrate greater S1 activity and a difference in the location of S1 activation in chronic LBP.16,19 Similarly, there is evidence of different M1 organisation characterised by a more posterior location and greater overlap of representations of the trunk muscles.
from The Journal of Pain http://bit.ly/2sxi09J
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