# Spatial localization investigated by continuous pointing during visual and gravitoinertial changes

Abstract : In order to accurately localize an object, human observers must integrate multiple sensory cues related to the environment and/or to the body. Such multisensory integration must be repeated over time, so that spatial localization is constantly updated according to environmental changes. In the present experimental study, we examined the multisensory integration processes underlying spatial updating by investigating how gradual modifications of gravitoinertial cues (i.e., somatosensory and vestibular cues) and visual cues affect target localization skills. These were assessed by using a continuous pointing task toward a body-fixed visual target. The single'' rotation of the gravitoinertial vector (produced by off-axis centrifugation) resulted in downward pointing errors, which likely were related to a combination of oculogravic and somatogravic illusions. The single'' downward pitch rotation of the visual background produced an elevation of the arm relative to the visual target, suggesting that the rotation of the visual background caused an illusory target elevation (induced-motion phenomenon). Strikingly, the errors observed during the combined'' rotation of the visual background and of the gravitoinertial vector appeared as a linear combination of the errors independently observed during single'' rotations. In other words, the centrifugation effect on target localization was reduced by the visual background rotation. The observed linear combination indicates that the weights of visual and gravitoinertial cues were similar and remained constant throughout the stimulation.
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https://hal.archives-ouvertes.fr/hal-01436922
Contributor : Christophe Bourdin <>
Submitted on : Monday, January 16, 2017 - 6:02:03 PM
Last modification on : Sunday, November 22, 2020 - 3:08:12 AM

### Citation

C. Scotto Di Cesare, L. Bringoux, C. Bourdin, F. R. Sarlegna, D. R. Mestre. Spatial localization investigated by continuous pointing during visual and gravitoinertial changes. Experimental Brain Research, Springer Verlag, 2011, 215 (3-4), pp.173-182. ⟨10.1007/s00221-011-2884-8⟩. ⟨hal-01436922⟩

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