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. 2019 Nov 20;123(1):243–258. doi: 10.1152/jn.00882.2018

Fig. 11.

Fig. 11.

Comparison of tilt versus translation eye movement data. A and B: to compare the changes in eye position elicited during static tilts to the axis of eye velocity during translations, the axes of translation (A) can be converted to equivalent tilt axes (B). The color and style of each line in A corresponds to the equivalent tilt axis of the same color and style in B. For example, a surge acceleration toward the front (solid yellow line at 0° in A) is equivalent to a tilt axis about the solid yellow at −90°, nose up in B. C and D: after adjusting the translation axes, we accounted for difference in the magnitude of eye movements between the 2 groups by taking the ratio of right eye/left eye magnitude (C) and by normalizing the data (D). C: similar pattern for tilts and translations with larger magnitude of eye movement elicited in the eye that is contralateral to the axis of the tilt (i.e., tilts about the left eye elicit larger right eye magnitudes of ocular countertilt and vice versa). D: to compare the direction of eye movements elicited from translations versus tilts, the normalized components for each case are shown, where the direction of eye movement is similar for each component between tilts and translations. Outliers larger than 1.5 times the interquartile ranger were removed (fewer than 14 of 441 samples were removed for each plot). A nonlinear mixed-effect model was created to predict each of these components (D) and the ratio of right/left eye movement (C), with fixed effects of tilt direction and type of movement (tilt or translation) and a random effect of chinchilla ID number. Model output is shown in red in C and D; model parameters are detailed in Table 3. An ANOVA of the results of this nonlinear mixed-effect models and a similar one after eliminating type of movement showed no detectable difference when a fixed effect of “type of movement” is included (P values for each model all >0.86), indicating that whether the eye movement was recorded during a tilt or translation did not play a significant role in creation of the model.