Efference, perceived movement, and illusory displacement.

Abstract Implications of the efferent signal associated with voluntary eye movements as a mechanism of perceived motion are reviewed. This signal normally subserves motion perception during pursuit eye movements and is also present when the pursuit is activated to prevent loss of fixation. Such efferent signals are the basis of a number of illusory motion and displacement phenomena. The contribution of efferent motion mechanisms to the oculogyral and apparent concomitant motion illusions is discussed. The phenomenon of roll-induced tilt is analysed in terms of illusory motion and displacement associated with voluntary cyclotorsional eye movements.

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