Sensation _ Perception - lecture 11 - theories of depth perception _ size constancy

Sensation _ Perception - lecture 11 - theories of depth perception _ size constancy

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Unformatted text preview: Lecture 11 Theories of Depth Perception & Size Constancy How do we convert the 2-D retinal image to a 3-D conscious percept? Empiricist Approach. Direct Perception. Computational Theories. Theories of Depth Perception Empiricist Approach George Berkeley Stimulus on the retina has only two dimensions (height and width). How do we see depth or distance? Learn depth cues by associating them with kinesthetic information about distance kinesthetic info is primary, visual info is secondary. Know about distance indirectly. Theories of Depth Perception Empiricist Approach Retinal image alone is not sufficient it must be enhanced. Hochberg & Constructivist Theory Stimuli are often ambiguous. Humans possess an internal problem-solving process that transforms incoming info. We construct the most reasonable interpretation of the evidence and this interpretation is what we see. Expectations play a pivotal role in constructing the visual scene. Theories of Depth Perception Direct Perception (Gibson, 1979) 3 central assumptions: All the info we need to see in 3-D is present in the retinal image or in relationships among parts of it. Visual scene is analyzed in terms of whole objects and surfaces instead of edges, colors, and specific locations. Impression of depth or distance arises immediately upon viewing the stimulus and requires no further computation or additional info. Theories of Depth Perception Direct Perception Depth cues are not relevant for depth perception in the real world. Texture gradients provide a scale that allows us to measure depth and distance. Ground Theory Distance perception depends on the information provided by surfaces in the environment. Ground often serves as the background. Theories of Depth Perception Computational Approach Goal = develop a set of rules and procedures that lead to the perception of distance and depth. Knowledge is crucial but approach focuses on general knowledge (laws of physics, geometry) and not specific knowledge (what an object does or is for)....
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This document was uploaded on 11/04/2011 for the course PSYCH 301 at Rutgers.

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Sensation _ Perception - lecture 11 - theories of depth perception _ size constancy

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