Fig. 9.

Bootstrap analysis for identification of the intercompartmental SO boundary orientation optimizing differential function during VFV. Center: quasi-coronal MR image illustrating that reference angle 0° was taken as the short axis of the ellipse that best fit the SO cross section. Flanking polar plots represent the difference in PPV change between the medial and lateral peripheral 40% compartments resulting from VFV compared with nonprism viewing. Positive angles are clockwise. Points significantly different from zero are indicated by bold pentagons, and included 30° for the SO ipsilateral to the prism, and both 30 and 45° for the SO contralateral to prism. Consistent significance at 30° both ipsi- and contralateral to prism justifies this angle as the best provisional intercompartmental border.