title: Intense pain influences the cortical processing of visual stimuli projected onto the sensitized skin.
abstract: Sensitization is a form of implicit learning produced by the exposure to a harmful stimulus. In humans and other mammals, sensitization after skin injury increases the responsiveness of peripheral nociceptors and enhances the synaptic transmission of nociceptive input in the central nervous system. Here, we show that sensitization-related changes in the central nervous system are not restricted to nociceptive pathways and, instead, also affect other sensory modalities, especially if that modality conveys information relevant for the sensitized body part. Specifically, we show that after sensitizing the forearm using high-frequency electrical stimulation (HFS) of the skin, visual stimuli projected onto the sensitized forearm elicit significantly enhanced brain responses. Whereas mechanical hyperalgesia was present both 20 and 45 minutes after HFS, the enhanced responsiveness to visual stimuli was present only 20 minutes after HFS. Taken together, our results indicate that sensitization involves both nociceptive-specific and multimodal mechanisms, having distinct time courses.
authors.affiliation: Institute of Neuroscience (IoNS), Cognitive and System Neuroscience Unit (COSY), Université Catholique de Louvain, Brussels, Belgium.
authors.forename: Diana M E
authors.initials: DME
authors.lastname: Torta
authors.forename: Emanuel N
authors.initials: EN
authors.lastname: Van Den Broeke
authors.forename: Lieve
authors.initials: L
authors.lastname: Filbrich
authors.forename: Benvenuto
authors.initials: B
authors.lastname: Jacob
authors.forename: Julien
authors.initials: J
authors.lastname: Lambert
authors.forename: André
authors.initials: A
authors.lastname: Mouraux
mesh_terms: D000328:Adult; D001703:Biophysics; D004558:Electric Stimulation / Q000009:adverse effects; D004569:Electroencephalography; D005074:Evoked Potentials, Visual / Q000502:physiology*; D005260:Female; D005403:Fixation, Ocular; D006801:Humans; D006930:Hyperalgesia / Q000503:physiopathology; D008297:Male; D010146:Pain / Q000209:etiology* / Q000473:pathology*; D010775:Photic Stimulation / Q000379:methods*; D012867:Skin / Q000294:innervation*; D055815:Young Adult