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. Author manuscript; available in PMC: 2015 Sep 5.
Published in final edited form as: Neuroscience. 2014 Jun 26;275:477–499. doi: 10.1016/j.neuroscience.2014.06.034

Figure 3.

Figure 3

Calibration of eye movement. A: The cat was seated in a comfortable position with its head fixed by the head base to an external frame so that the cat’s eyes were 57 cm away from a 20″ computer screen. A 2.5 cm in diameter round target was presented on the screen and moved with a speed of 3–7 deg/s either horizontally or vertically along a standard grid. Using positive reinforcement (food), cats were trained to follow the target with their gaze. B: A sample record of eye movement of the cat when the cat was visually tracking the target in the vertical (pitch) plane. When calibration coefficients (gain and offset, see text) were taken into account, the eye movement (black W-shaped trace) closely followed, albeit in small steps, the moving visual target (red W-shaped trace). At the same time, in the horizontal (yaw) plane the eye (black lower trace) stayed quite precisely together with the target (red lower trace).