Abstract
The vestibular system analyses angular and linear accelerations of the head that are important information for perceiving the location of one’s own body in space. Vestibular stimulation and in particular galvanic vestibular stimulation (GVS) that allow a systematic modification of vestibular signals has so far mainly been used to investigate vestibular influence on sensori-motor integration in eye movements and postural control. Comparatively, only a few behavioural and imaging studies have investigated how cognition of space and body may depend on vestibular processing. This study was designed to differentiate the influence of left versus right anodal GVS compared to sham stimulation on object-based versus egocentric mental transformations. While GVS was applied, subjects made left-right judgments about pictures of a plant or a human body presented at different orientations in the roll plane. All subjects reported illusory sensations of body self-motion and/or visual field motion during GVS. Response times in the mental transformation task were increased during right but not left anodal GVS for the more difficult stimuli and the larger angles of rotation. Post-hoc analyses suggested that the interfering effect of right anodal GVS was only present in subjects who reported having imagined turning themselves to solve the mental transformation task (egocentric transformation) as compared to those subjects having imagined turning the picture in space (object-based mental transformation). We suggest that this effect relies on shared functional and cortical mechanisms in the posterior parietal cortex associated with both right anodal GVS and mental imagery.
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Notes
The upright (0°) and the upside-down conditions (180°) were not included in this first ANOVA since they cannot be assigned to either a clockwise or counterclockwise Stimulus Orientation and subjects reported having used other strategies than mental rotation for the 180°angle (see below).
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Acknowledgments
This work was supported by the Cogito Foundation, the Fondation de Famille Sandoz, the Fondation Odier de Psychophysique, and the Swiss National Science Foundation. We thank Pär Halje for the programming of the stimuli and Dr. Raphaël Holzer for technical assistance.
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Lenggenhager, B., Lopez, C. & Blanke, O. Influence of galvanic vestibular stimulation on egocentric and object-based mental transformations. Exp Brain Res 184, 211–221 (2008). https://doi.org/10.1007/s00221-007-1095-9
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DOI: https://doi.org/10.1007/s00221-007-1095-9