Investigating the effects of multisensory interaction between nociception and vision on the motor system

Filbrich, Lieve;Lambert, Julien;Legrain, Valéry
(2023) 13th Congress of the European Pain Federation Efic — Location: Budapest (20.September.2023)

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The study of multisensory interaction is a growing field in pain research. Mutual interactions between nociception and vision have recently been highlighted, showing that near visual stimuli can influence nociceptive perception and vice-versa. However, while the existence of such multisensory perceptual effects in pain seems now established, their functional role has rarely been considered yet. Although there is evidence for a close relationship between pain and the motor system, it is currently not known whether and how nociception-induced motor effects could be modulated by interactions with vision. Here we investigated the influence of nociceptive-visual interaction on the motor system of healthy participants, by testing whether nociception-induced changes of corticospinal excitability (n-CSE) can be modulated by visual stimuli presented near the stimulated hand. Nociceptive heat stimuli were applied on the right hand, followed by a dynamic visual stimulus rapidly approaching a location either near or far from the stimulated hand. CSE was assessed as motor-evoked potentials (MEPs) in the right first dorsal interosseous muscle of the stimulated hand, elicited by single-pulse transcranial magnetic stimulation over the left primary motor cortex hand representation. Conditions comprising only nociceptive or visual stimuli (near or far) were also presented. Results show a general reduction of MEPs 200 ms after the potential occurrence of the nociceptive stimulus, but no significant difference between conditions. These results suggest that the reduction in n-CSE is not specific to the nociceptive modality and that our experimental setting did not allow to highlight specific visual-nociceptive interaction effects on the motor system.
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Filbrich, L., Lambert, J., & Legrain, V. (2023). Investigating the effects of multisensory interaction between nociception and vision on the motor system. 13th Congress of the European Pain Federation Efic, Budapest. https://hdl.handle.net/2078.5/26973