Visual Illusions of Movement.

The autokinetic, oculogyral, and oculogravic illusions a l l involve apparent motion orI t i s shown that these illusionsdisplacement of the visual f ield with respect to an observer.are related to involuntary eye movements, occurring either spontaneously as i n the autokineticillusion, or in response to the special stimuli associated with the other two illusions. Duringfixation the visual sensation o f movement seems to be produced by, or related to, the patterno f efferent act ivi ty aimed at the group of extraocular muscles which w i l l act as antagonists tothe involuntary eye movement referred to, U NC LASS IFlEDSecurity Classification 4.K E Y WORDSL I N K AR O L EW T I I lusionsdeaf subjectseye movementslabyrinthine functionautokinetic illusionfixation reflexoculogyrali I lusionangular accelerationoculogravic illusionlinear accelerationafter imagesefferent act ivi tyex traocuI a r musc Iessensat ionnvstagmusL I N K BR O L E INSTRUCTIONS1. 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