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. Author manuscript; available in PMC: 2008 Dec 22.
Published in final edited form as: Exp Brain Res. 2008 Aug 13;190(4):369–387. doi: 10.1007/s00221-008-1504-8

Figure 4.

Figure 4

Single trial example of a gaze shift (and the eye and head components of the movements) made when the head is free to move. Gaze is the direction of the line of sight relative to an external/spatial reference, Head is the position of the head relative to an external/spatial reference, and Eye is the position of the eye relative to the head. Eye position + Head position at each time sample equals Gaze position. Experimentally, gaze and head positions are measured directly using scleral and head-mounted coils sitting inside alternating magnetic fields (Fuchs and Robinson 1966; Judge et al. 1980) and eye position is calculated by subtracting head from gaze positions. Arrows indicate features of eye-head movements, discussed more fully in related text.