Fig. 1.

Schematic of our hypothesis. An observer is looking at a scene while maintaining fixation (dashed line) at an object. The visual system stores spatial information of the scene in an eye-centered representation, relative to the point of fixation (indicated by the dashed line). By using gaze position, this representation is transformed into a body-centered representation where objects in the scene are stored relative to observer (indicated by the solid line). Vestibular (and other extra-retinal information) is used to update both representations across body translation (white arrow). Since the location of the observer has changed, each representation should be updated to account for the current eye/body position. Both maps are optimally combined (optimal integration) by taking into account the reliability of the spatial information in each reference frame and the appropriate coordinate transformations between reference frames.