Fig. 3. Normal optokinetic response to a whole-field stimulus, displayed as horizontal eye position (degrees) over time (s). (A) Butterflyfish, (B) pipefish, (C) sandlance. The stimulus speed varied from 25 to 35° s^-1 between animals and the speed and direction of the stimulus are indicated by the grey lines. Note the regular and conjugate response in the butterflyfish while the sandlance shows asynchronous fast phases. In the pipefish, some linked fast phases can be seen, although the amplitude of the movement in each eye is mostly different.