Extraocular Proprioception and Body Postural References

Painless, well patterned vibrations, applied with an increasing frequency from 10 to 80 Hz, to either the medial or lateral rectus of a subject’s eye(s) (right, left or both), were found to induce directional perceptual and motor effects which were closely related to the postural context. The same was true with the superior and inferior recti. Illusory and/or actual movements of head, trunk or whole body were produced depending on the postural constraints (head free or fixed, standing or seated subject). Likewise, illusory directional shift of a visually fixed target in darkness during extraocular muscle vibration was reported by subjects. The contribution of extraocular proprioception to the coding of eye, head and body position in relation to postural and environmental conditions is discussed.

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