Gregory's Visual Perception

  • Created by: katielou
  • Created on: 12-04-19 19:31
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  • Indirect Visual Perception & Recognition
    • GREGORY'S THEORY OF INDIRECT PERCEPTION / Constructivist theory = recognition driven (point is to identify what we are looking at)
      • Top down approach - take info about environment from light waves and stored knowledge/past experiences
      • Perception = hypothesis (based on prior knowledge) which is tested. Forming incorrect hypothesis = perception errors (visual illusion)
    • Depth Cues: Monocular cues needed to transform 2D retinal image
    • M1, Linear Perspective: converging lines show depth
    • M2, Aerial Perspective: Scattered light as travels = hazy distant objects
    • M4, Interposition: Depth shown when nearer object hides more distant object
    • M3, Shading: Shadows show 3D, and top down knowledge of where light source is
    • M5, Relative/Familiar Size: Know normal size using top down, so judge distance
      • Eg, Littleson & playing cards (normal, half, double size)
    • Evaluation: + Explains workings of visual illusions, + Explains cultural/individual variations of perception, - Ideas about hypothesis testing = vague, - Still perceive things incorrectly when we know (hollow face illusion), - Perceptual development (neonates prefer shapes with no top down experience)
    • Modern Approach = Dual Process Account (Norman 2002) - dorsal (Gibson) & ventral (Gregory) streams work separately but parallel
      • Optic Ataxia - damage to dorsal, can recognise not interact. Visual agnosia - damage to ventral, can't recognise but can interact.

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