Multisensory interaction between nociception and vision in limb-centered peripersonal frames of reference
(2016) International multisensory research forum (IMRF) — Location: Suzhou, China (15.June.2016)
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- Abstract
- In order to adapt behaviors to a potentially damaging threat, it is crucial to coordinate the perception of the location of the threat in external space and that of the location of the potential damage on the body surface. Here, we investigate how a nociceptive stimulus applied to the hand affects the perception of visual stimuli occurring near the hand, placed either near or far from the body trunk according to the anteroposterior axis. In a temporal order judgement task, participants judged which of two visual stimuli had been perceived first. Each pair of visual stimuli was preceded by one nociceptive stimulus applied on one of the two hands (unilateral) or two nociceptive stimuli, one applied on each hand simultaneously (bilateral). In the bilateral condition, participants judgments were slightly shifted toward the visual stimulus the closest to the trunk. Despite this overall bias for proximal space, results in the unilateral conditions showed that judgments were shifted towards the visual stimuli which occurred near the hand on which the nociceptive stimulus was applied, independently of its position relative to the trunk. These results suggest the existence of cortical representations of each limb that extend slightly from their corporeal boundaries to external space, and which are used as an interface to integrate somatosensory and non-somatosensory information. Depending on the context (e.g., the occurrence of a nociceptive stimulus), these representations could take into account the relative position of the limb in space, instead of a main body reference defined by the trunk.
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Vanderclausen, C., Filbrich, L., Alamia, A., & Legrain, V. (2016). Multisensory interaction between nociception and vision in limb-centered peripersonal frames of reference. International multisensory research forum (IMRF), Suzhou, China. https://hdl.handle.net/2078.5/183010