Visual Illusions - Monocular Cues

Follow the links in the table below to view graphical images demonstrating an example or an illusion of each monocular cue.
Linear PerspectiveTwo converging lines appear to be parallel and receding in depth (Wickens, 1992).
InterpositionThis is when one object obscures another, the object that is partially obstructed appears more distant (Wickens, 1992.)
Height in the PlaneDuring normal viewing objects that are higher in our visual field are assumed to be further away (Wickens, 1992).
Light and ShadowAn objects' shadow when lighted provides some clues about the objects' orientation relative to us and its three-dimensional shape (Wickens, 1992).
Relative SizeIf through experience we know that two objects are the same true size, the object subtending a smaller image on the retina appears to be further away (Wickens, 1992.)
Textural GradientsTextures grow finer at a greater distance (Wickens, 1992).
Proximity-luminance covarianceThis cue is closely related to textural gradients in that the closer an object is the brighter it appears. Therefore a reduction in illumination and intensity are assumed to be further away (Wickens, 1992).
Aerial PerspectiveThe more distant an object is the "hazier" and less clearly defined it is (Wickens, 1992).
Relative motion parallaxWhen we move relative to a three-dimensional picture the objects that are closer appear to have greater relative motion to those that are further away (Wickens, 1992).

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Dave Crow

Last updated: Nov28,1995: Dave Crow