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Every time we move our body, we use attention and body representation to interact with our environment. Patients with Complex Regional Pain Syndrome (CRPS), a disorder of severe chronic limb pain, show clear deficits in body representation. Results on possible deficits in spatial attention have been inconclusive, although spatial attention might play a key role in the underlying deficits in CRPS. Prior CRPS studies have investigated attention in isolation of body representation. I am convinced that attention deficits in CRPS are a prominent feature of the disorder, but are inextricably linked to the disturbed body representation. In this view, CRPS patients only show a spatial attention bias away from the affected side when the (impaired) body representation is activated. More specifically, attentional deficits are observed: (1) when stimuli are presented in the space surrounding the affected limb, or (2) when body-related stimuli are used. I will test these hypotheses using digitized tasks that are specific to the body-related bias, and eye-movement recordings that can reveal even the most subtle alteration of attention. Diminishing the attention bias in CRPS could potentially decrease pain. Understanding in which circumstances attention is disturbed is therefore a first step in the development of CRPS treatment.
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