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Efficiently reacting to painful events requires an optimally integrated multisensory representation of the body and its surrounding space, coordinating the processing and integration of somatic and extra-somatic stimuli occurring near the body. While such representations would allow optimizing manipulation of innocuous objects, they would also optimize defensive actions against threatening stimuli. Multisensory interactions between nociceptive and near visual stimuli have recently been evidenced. Here we investigated the influence of such nociceptive-visual interaction on the motor excitability of the hand on which nociceptive stimuli are applied in healthy volunteers, by testing whether nociception-induced changes of cortico-spinal excitability (n-CSE) can be differently modulated by visual stimuli presented in the space surrounding the hand vs. visual stimuli presented farther away. CO2-laser nociceptive stimuli were applied on the right hand, followed by 80 ms by a visual stimulus rapidly approaching a location either near or far from the stimulated hand. During each trial, single-pulse transcranial magnetic stimulation over the left M1 hand representation was applied at one out of 3 possible time points (at baseline, 150 or 200 ms after the nociceptive stimulus), eliciting motor-evoked potentials (MEPs) in the right first dorsal interosseous muscle. Conditions comprising only nociceptive or visual stimuli (near or far) were also presented. Preliminary results show a general reduction of MEPs 200 ms after the potential occurrence of the nociceptive stimulus. However, this reduction seemed not differently modulated by near vs. far visual stimuli, suggesting that our experimental setting did not allow to highlight specific visual-nociceptive interaction effects on CSE.
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Filbrich, L., Lambert, J., & Legrain, V. (2020). Investigating the multisensory influence of vision on nociception-induced corticospinal excitability. YRD of the Belgian Pain Society, Brussels. https://hdl.handle.net/2078.5/113842