PSU KINES 171 - Perception (20 pages)

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Perception



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Perception

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Pages:
20
School:
Pennsylvania State University
Course:
Kines 171 -

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Perception The process by which sensory input is organized and formulated into meaningful experiences Nativism vs Empiricism Perception Sensation the activity of sensory receptors and the resulting afferent transmission Perception is the activity of mediating processes which integrate present input with past input Perception At birth the human infant is basically a reflex organism Stages of Perceptual Development A shift in the hierarchy of the dominant sensory systems An increase in intersensory integration Improvement in intrasensory discrimination Perception 1 In early stages of perceptual dev There is a shift from the dominance of somatosensory receptors to greater utilization of visual and auditory 2 Stimuli in the real world are multivariate the ways in which they may be perceived vary use of multicues Perception 3 Each sensory system develops a more precise ability for detecting discriminating recognizing identifying stimuli Hierarchial Ordering of Perceptual tasks detection discrimination recognition identification Perception How do we perceive that an object has constant size constant form constant color Despite different distances different perspectives different illuminations Perception An enormous amount of integration and interpretation must occur in the brain to give us visual perception image has 2 dimensions we see 3 dimensions we perceive our world right side up retina image is upside down disparities in retinal image we see the actual size receive image with millions of separate cells in retina we see a unified object Perception The eye must refract light rays so they focus on the retina Refraction begins at cornea and continues in the lens The lens can change its convexity by contracting the ciliary muscles Perception Visual Acuity Factors graininess the denseness of receptors in the retina fovea density of cones 147 000 sqmm increasing number of receptors both cones and rods which converge on each bipolar cell moving from the fovea to the edge of



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