The Ecological Approach to Visual Perception

  • Created by: Chloe
  • Created on: 24-04-15 14:27
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  • The Ecological Approach to Visual Cognition
    • Gibson's theory
      • • First developed in WW11     •Optic flow patterns: a fixed point, the pilot moving appears motionless while the rest of the visual environment is moving away from the fixed point
        • • As we move through the visual world the image on the retina changes       • The optic array of most surfaces continuously changes with the viewers movement
      • Basic principles of theory
        • (1) Enough into about the spatial layout of the environment is picked up directly, rather than as a result of processing & analysing various distance & depth cues
        • (2) Info for depth & distance is contained fully within the optic array projected on the eyes
        • Therefore.. no interpretation or evaluation of spatial cues is needed as the optic array provides into which enables the perception of the visual world
    • Invariants
      • Optic flow patterns: the pattern of the array remains constant as the observer moves
      • Motion perspective: the relative distance of objects remains constant
      • Texture gradients:   •Increasing distance = texture elements appear finer or denser      • Decreasing distance = texture elements appear coarser
    • Traditional Theory:   •perception is indirect & influenced by higher cognitive processes      • We don't "just see" the world but actively construct it from perceptual info we receive
    • Gibsons theory: Perception is direct & not mediated by inference or problem solving


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