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. Author manuscript; available in PMC: 2007 May 24.
Published in final edited form as: Invest Ophthalmol Vis Sci. 2005 Aug;46(8):2800–2809. doi: 10.1167/iovs.05-0147

Figure 4.

Figure 4

Head and eye position in quaternions, rotated into Listing’s coordinates. Horizontal and vertical offsets have been subtracted to indicate a starting position of zero for clarity. A set of four trials is shown in which the head moved to the left, initial gaze was 20° down, and saccades were made upward to the 0° position. Dashed line: head position, which was identical in each trial. Single dark line: eye responses. (A–C) Responses as a function of time; (D, E) previously defined LP in earth-fixed coordinates, in its orientation before head motion. Note that the eye position remains out of LP after saccades.