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Fixational eye movements. A, B, Distributions of instantaneous translational (A) and rotational (B) eye velocities. Data refer to the displacements in the eye-center position caused by head movements in A and to eye-in-head rotations in B. Each histogram shows the velocity on 1 degree of freedom, with its mean ± SD reported in each panel. Each column shows data from one subject. Data refer to the right eye; the left eye moved in a highly similar manner.
