Chronic Whiplash Associated Disorders: Disability, Pain (Beliefs), Central Sensitization and Brain Activity

"Electrical detection and pain thresholds will be determined (at the sural nerve of the dominant leg and at the median nerve of both arms) with a constant current electrical stimulator.~Endogenous pain facilitation will be assessed by a temporal summation paradigm by delivering 20 electrical stimuli at the intensity of the electrical pain threshold.~Endogenous pain inhibition will be assessed by a conditioned pain modulation paradigm with electrical stimulation as test stimulus and the cold pressor test as conditioning stimulus.~EEG measurements with be performed with scalp EEG with 32 surface Sn electrodes in a headcap in referential montage following the standard 10-20 recording system.~A 5 minute resting state measurement will be performed with eyes closed, followed by EEG measurements during the condition pain modulation paradigm to assess the evoked-related potentials."