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Sense And Perception Test 3

12 Pages

Course Code
PSYC 4031

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Distance and size perceptionDistance PerceptionAbility to perceive the distance relationships within a visual sceneEgocentric DistanceDistance of an object from an observerRelative Distance Distance of one object from another Also called Allocentric DistanceCuefactor that enables an observer to make a decision automatically and spontaneouslyMonocular cueCues that require only one eye to be effectiveBinocular CueDisparity between images on the left and right eyePictorialStatic Cuescues that do not moveOcclusioninterpositionoverlapone object covering another Judgment that the partially covered object is further away than the object that is completely visibleLinear Perspectivestrategy used by artists to represent a three dimensional world on a two dimensional surfaceDistance in linear perspective occupies an increasingly smaller part of the retina as we see portions that are closer to the horizonSize Cuescues that refer to the influence of an objects size on distance estimatesFamiliar size of an object is a helpful clue because often objects are found in standardized sizesRelative sizethe size of a novel objectthe objects size relative to other objectsPerceived distance is quite important when judging the size of an objectTexture Gradientrefers to the fact that when surfaces are viewed at a slant the texture of surfaces becomes denser as the distance increasesAre so powerful cues to depth that even simple schematic representations are sufficient to produce a clear sense of depthAtmospheric perspectiverefers to the observation that distant objects often look blurry and bluish in contrast to near by objectsThis effect rises because the air between an observer and an object is not perfectly clearAlso particles in the air slightly change the light reflected from objects so that they appear bluishShadingcue provided by the pattern of light and shadows helps determine and define the shape of objects because it provides information about parts of an object that stick out or cave inward and also about flat and curved partsPosition of a light source has an impact on shape and depth perceptionHeightelevation cuesrefer to the observation that objects near the horizon appear to be further away from us than objects far from the horizonTrompe loeilart that fools the eye by creating a vivid impression of depth on a twodimensional surfaceMonocular Depth Cues involving motionperceptual experiences are interrelatedlightness perception depends on depthMotion parallaxthe fact that as you move your head objects at different distances appear to move in different directions at different speedsParallax is a change in position motion parallax is a change in position of an object caused by the observers motionMotion parallax depends on two sequential images from different locations effectiveness depends on pursuit eye movementsThe retinal changes due to motion parallax would be similar for near or distant objects thus pursuit eye movements help disambiguate depth informationKinetic Depth Effectfigure that looks flat when stationary appears to have depth when it movesMissing most other depth cues such as interposition shading and texture gradientBinocular Disparity and StereopsisBinocular disparity refers to the different information that is registered on the two eyesImportant because it provides the information necessary for stereopsisthe ability to judge depth binocularlyHoropterimiginary curved line that can be drawn to represent all the points othat are the same distance from the observer as the focal objectPanums areaarea on and near the horopter in which images of the object on the two retinas can be focusedCrossed disparityobjects nearer to the viewer than to the focal point create crossed disparity with the image falling outside of the focal point on each retinaUncrossed disparitycue that objects are far from us created by objects that appear behind the horopter
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