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PSYC 1020 Sensing and Perceiving II

Y. PSYC 1020 Sensing and Perceiving II. Dr. Jack Broerse. Colour Size, Distance & Shape Figure & Ground. Internet : http: // www.psy.uq.edu.au. Colour Vision: Trichromacy. H. von Helmholtz (19th century) Thomas Young (19th century) Representation (Artists & Painters)

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PSYC 1020 Sensing and Perceiving II

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  1. Y PSYC 1020Sensing and Perceiving II Dr. Jack Broerse Colour Size, Distance & Shape Figure & Ground Internet : http: // www.psy.uq.edu.au

  2. Colour Vision:Trichromacy • H. von Helmholtz (19th century) • Thomas Young (19th century) • Representation (Artists & Painters) • Red (long), Green (medium), Blue (short)

  3. Three Primary Colours Colour Vision:Trichromacy and Colour Mixture Hue Saturation Brightness

  4. Chromatic Adaptation Negative Colour Afterimages : Induction

  5. Chromatic Adaptation Negative Colour Afterimages : Test

  6. Figure-Ground Segregation Perceptual Grouping M ii ii iii ii iii ii M Closure Proximity – – – + + + Good Figure ? – – – Similarity

  7. Colour Vision:Opponent Processing • E. Hering (19th century) • The problem of “yellow” • The problem of “negative afterimages” and complementary colours

  8. Colour Vision:Three Opponent-Colour Channels Chromatic Achromatic _ 1 _ 3 + _ 2

  9. Colour Vision Deficiencies ABNORMAL MATCHES & POOR DISCRIMINATION GREEN–RED & YELLOW–RED CONFUSIONS BLUE–GREEN CONFUSIONS

  10. Why Do Things Look Like They Do? • Because they are what they are • Because we are what we are Kurt Koffka 1935 “Principles of Gestalt Psychology”

  11. Size & Distance Perception Proximal Stimulus Distal Stimuli

  12. Size Constancy Size-distance relationships Texture & Perspective Occlusion Relative Size

  13. Size–Distance Illusions The Ponzo Illusion

  14. Binocular Depth & Distance Retinal Disparity Left Eye View Right Eye View

  15. Shape Constancy A special case of size constancy

  16. Shape Constancy & Motion Object Rigidity

  17. Depth Size OBJECT Shape Colour OBJECT Size Shape Colour Depth Figure-Ground Segregation The Gestalt Alternative Conventional Psychology Gestalt Psychology

  18. Find The Hidden Figure At first glance, this appears as random blobs of different size. Look again! Once seen, it is difficult not to see the figure.

  19. Figure-Ground Segregation Perceptual Grouping M ii ii iii ii iii ii M Closure Proximity – – – + + + Good Figure ? – – – Similarity

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