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4 object perception supporting the nativist position

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Unformatted text preview: coherence among moving elements. 4. Object Perception   supporting the nativist position, visual experience doesnt seem to be necessary for perceptual constancy Perceptual constancy is the perception of objects as being of constant size, shape, color, etc., in spite of physical differences in the retinal image of the object. -if an infant looks at the larger, but farther away cube, researchers will conclude the child has size constancy 4 5/29/13 Object Segregation       Infants who see the display in figure (a) perceive it as two separate objects , a rod moving behind a block After habituating to the display, they look longer at two rod segments than at a single rod (b) indicating that they find the single rod familiar but the 2 segments novel If they first see a display with no movement, they look equally long at the two test displays. this result reveals the importance of movement for object segregation ex: it is impossible to know for sure whether what you see is one object or 2 Object Segregation   The identification of separate objects in a visual array   Two-month-old infants use common movement to perceive object segregation   -because of your knowledge about gravity and support, you can be sure that this figure (b) is a single, albeit very odd object Older infants, like adults, use additional sources of information for object segregation includes their general knowledge about the world 5. Depth Perception   Infants as young as 1 month respond to optical expansion, a depth cue in which an object occludes incresingly more of the background, indicating that the object is appraoching   Stereopsis, the process by which the visual cortex combines the differing neural signals caused by binocular disparity -the slightly different signals sent to the brain by the two eyes -emerges suddenly at about 4 mos 5 5/29/13 Depth Perception   At about 6–7 months of age, infants become sensitive to a variety of monocular or pictorial cues , the perceptual cues of depth that can be achieved by 1 eye alone -these include relative size and interposition Depth Perception   This 7-month-old infant is using the monocular depth cue of relative size.   -wearing an eye patch to take away binocular depth info -baby reaches to the longer side of the trapezoidal window This behavior indicates that the baby sees it as the nearer, and hence more readily reachable, side of a regular window. Pictorial Representations   newborns can recognize two-dimensional versions of three-dimensional objects   -children must come to understand their symbolic nature Infants and toddlers attempt to treat pictures as though they are real objects -->not until about 19mos and have had substantial experience with pictures 6 5/29/13 B. Auditory Perception   The human auditory system is relatively well developed at birth hearing doesnt appraoch adult levels until 5 or 6     Newborns turn toward sounds, a phenomenon referred to as auditory localization. Infants are remarkably proficient in p...
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