Fig. 9.
Translational vestibulo-ocular reflex (VOR) elicited during translations along axes in the coronal plane. Binocular 3-dimensional eye velocities recorded from 6 chinchillas, elicited during 1-Hz sinusoidal translations in the coronal plane with a 2 m/s2 peak acceleration. A: the binocular axes of eye velocity; normalized vectors shown in B to better visualize the spatial spread for each translation direction. B: each animal’s data are represented with the markers described in the legend. C: color of each vector indicates the translation direction as illustrated. In A, an asymmetry between the right and left eye velocity magnitude is seen, similar to that seen in Fig. 8A, where each eye’s velocity is greatest during translations along axes approximately aligned with the ipsilateral eye. D: boxplot further emphasizes the point from A, showing the ratio of right eye/left eye velocity. Translations oriented along the quadrant of the right eye (pink, red, and orange in A and B) elicit a larger right eye velocity than left (ratio>1 in D). Translations oriented along the quadrant of the left eye (green, light blue, and dark blue in A and B) elicit a larger left eye velocity than right (ratio <1 in D). E: boxplot shows component-wise eye velocities. During coronal plane translations, the eyes generally show conjugacy in all 3 components, except during heave (0°, 0°) and lateral (90°, 90°) movements. All outliers larger than three times the interquartile range for D and E were removed (fewer than 13 of 131 samples were removed for each plot). Each box for each axis has samples n ≥ 14.