Sensation _ Perception - lecture 10 - perceiving a 3-d world

Sensation _ Perception - lecture 10 - perceiving a 3-d...

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Perceiving a 3-d world Lecture 10
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Distance and Depth Perception Depth perception is a pretty amazing process  considering the image on the retina is a flat, 2-D one. How do we convert this 2-D image to a 3-D one?
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Distance and Depth Perception Distance Perception Our ability to perceive distance relationships within a visual  scene. Three different types: Egocentric Distance Relative Distance Objects are 3-D
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Distance Perception Egocentric Distance AKA: Absolute Distance. Distance of the object from the observer. Involves the process of egocentric localization .
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Distance Perception Relative Difference How far two objects are from each other. Objects are 3-D Objects themselves possess depth/thickness … some parts of  an object look farther away than other parts.
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Perceptual Development The Visual Cliff Apparatus Shallow side. Apparently deep side. Piece of glass extending from shallow side, over apparently  deep side.
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Perceptual Development The Visual Cliff Apparatus Studies done with a number of different animals as well as  human infants. In all cases when testing young animals and infants, a  preference for the shallow side was displayed. Demonstrates that depth perception is hardwired.
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Perceptual Development The Visual Cliff Apparatus When cats or rats are reared in the dark however, they show  little depth perception when first tested on the visual cliff. Depth discrimination rapidly improves with experience. Preference for deep or shallow side in dark reared rats vs.  light reared rats. Rats reared in the dark for a long period of time (60 to 90 days)  showed deficits in sensitivity to weak depth cues. Sensitivity to strong depth cues was not affected.
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Perceptual Development The Visual Cliff Apparatus Provides a demonstration of how experience interacts with  processes that are somewhat innate to produce a perceptual  ability (perceiving depth). Research suggests the existence of a  critical period  in  perceptual development.
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Sources of Information Monocular Factors Binocular Factors Binocular  Parallax Convergence No Movement Movement Eye Muscles  Involved Pictorial Cues Motion  Parallax Kinetic Depth  Cues Accommodation Inter- position Size Texture Gradient Linear Perspective Atmospheric Perspective Shading and  Shadows Height
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Perceiving Depth Can perceive depth with or without motion cues. Some depth cues require two eyes (binocular cues) 
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Sensation _ Perception - lecture 10 - perceiving a 3-d...

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