Patients with complex regional pain syndrome overestimate applied force in observed hand actions.

European Journal of Pain : EJP
J HottaNina Forss

Abstract

Movement accuracy is ensured by interaction between motor, somatosensory, and visual systems. In complex regional pain syndrome (CRPS), this interaction is disturbed. To explore CRPS patients' visual perception of actions, we investigated how these patients evaluate the applied force in observed hand actions of another person. Nineteen patients suffering from unilateral upper-limb CRPS and 19 healthy control subjects viewed six different videos of left- and right-hand actions. They were asked to evaluate the applied force in each hand action, as well as their subjective sensations of unpleasantness and pain during the observation. The patients overestimated the force applied in the videos: the ratings were two times as large as in the control subjects for actions performed with the hand corresponding to the patients' affected hand, and 1.5 times as large for actions corresponding to their healthy hand. The control subjects considered the stimuli neutral and painless, whereas the patients rated them unpleasant. Moreover, the patients felt increased pain during viewing actions performed with the hand corresponding to their affected side. The overestimation of force was related to the elicited unpleasantness and pain, but not to t...Continue Reading

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Citations

Jul 30, 2009·The Journal of Pain : Official Journal of the American Pain Society·Nuutti VartiainenNina Forss
Oct 6, 2018·European Journal of Pain : EJP·Jörg TrojanChristian Maihöfner
May 20, 2017·Brain and Behavior·Jaakko HottaRiitta Hari

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