Summary
The present study attempts to clarify the relationship between eye and body positioning during an upside-down standing posture on the hands. In this posture the head was observed to be stable and the eyes were anchored to an earth-fixed target. We measured the variations of body sway when subjects displaced their gaze upward or downward from their anchoring position. They did this voluntarily under instruction, and involuntarily by means of base-down or base-up wedge prisms. Results show that the anchoring point chosen by the subjects corresponds to a perceived limit of their body sway. They suggest that vision is also used to convey the desired optimal zone for the center of gravity in cases where fine balance is required.
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Clément, G., Pozzo, T. & Berthoz, A. Contribution of eye positioning to control of the upside-down standing posture. Exp Brain Res 73, 569–576 (1988). https://doi.org/10.1007/BF00406615
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DOI: https://doi.org/10.1007/BF00406615