Figure 1: (a) When the eye is stationary, both efference copy (EC) and afference produced by displacement of the retinal image (A) are absent. (b) Turning the eye 10° to the right results in a corresponding shift of the retinal image. Since the magnitude of the eye movement specified by EC and the magnitude of retinal image displacement cancel out, no movement in the world or “exafference” (EA) is registered.