Waarom je ziet wat je ziet     Frans W. Cornelissen & Barbara NordhjemLaboratorium voor Experimentele Oogheelkunde        ...
Google: visueel vergelijkbare beelden?
Niet slecht
Google vindt dit vergelijkbaar
Google had ook deze beelden kunnen tonen               Maar deed dat nietWaarnemen en herkennen is geen triviaal probleem!
Waarom zien we wat we zien?
11
Kijk naar de rode stip         QuickTime™ and a         GIF decompressor are needed to see this picture.
Kijk naar je buurvrouw of -man
QuickTime™ and a        GIF decompressorare needed to see this picture.
QuickTime™ and aJVT/AVC Coding decompressorare needed to see this picture.
Functionele specialisatie
Medische relevantie?
Patiënten met schizofrenie minder invloed van context,          daardoor BETER in matching taken                          ...
Mogelijk samenhang met kleinere receptieve velden           in de primaire visuele cortex                                 ...
Face adaptation
QuickTime™ and a  Photo - JPEG decompressorare needed to see this picture.
QuickTime™ and a  Photo - JPEG decompressorare needed to see this picture.
QuickTime™ and a      H.264 decompressorare needed to see this picture.
Waarom je ziet wat je ziet    Je brein vergelijkt visuele informatie           over de tijd en ruimte,           past zich...
Zien is vergelijkenWorkshop: Hand illusie
Zien is leren en interpreteren
QuickTime™ and a                  QuickTime™ and a  Photo - JPEG decompressor         Photo - JPEG decompressorare needed ...
Zelfde gezichtHoog Contrast               Laag Contrast   Vrouw                         Man
38
40
41
Zien is leren en interpreteren     Hollow Face IlusionWorkshop: maak je eigen illusie
Waarom je ziet wat je ziet       Je brein vergelijkt visuele informatie              over de tijd en ruimte,              ...
46
Lothar Spillmann, Joe Hardy,Peter   Delahunt,    BaingioPinna, and John S. Werner                                         ...
Courtesy Stevin Dakin, UCL
Courtesy Stevin Dakin, UCL
What do we need to perceive a moving person?                      QuickTime™ and a                  Animation decompressor...
QuickTime™ and a        GIF decompressorare needed to see this picture.
QuickTime™ and a            GIF decompressor    are needed to see this picture.“Change blindness”
Can you see this?                    60
Neon color spreading    van Tuijl (1975)
Watercolor effectPinna, Brelstaff & Spillmann (2001)
Illusions - in Dutch
Illusions - in Dutch
Illusions - in Dutch
Illusions - in Dutch
Illusions - in Dutch
Illusions - in Dutch
Illusions - in Dutch
Illusions - in Dutch
Illusions - in Dutch
Illusions - in Dutch
Illusions - in Dutch
Illusions - in Dutch
Illusions - in Dutch
Illusions - in Dutch
Illusions - in Dutch
Illusions - in Dutch
Illusions - in Dutch
Illusions - in Dutch
Illusions - in Dutch
Illusions - in Dutch
Illusions - in Dutch
Illusions - in Dutch
Illusions - in Dutch
Illusions - in Dutch
Illusions - in Dutch
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Illusions - in Dutch

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  • Not to claim that the only thing going wrong here is picking the right features!
  • Silencing illusion
  • Face adaptation phenomenon. Explanation: brain contains populations of face sensitive neurons. Neurons adapt, in a similar way as occurs during colour adaptation. Different faces adapt different face neurons.
  • Face adaptation phenomenon. Explanation: brain contains populations of face sensitive neurons. Neurons adapt, in a similar way as occurs during e.g. colour adaptation. Different faces adapt different face neurons.
  • In the Illusion of Sex, two faces are perceived as male and female. However, both faces are actually versions of the same androgynous face. One face was created by increasing the contrast of the androgynous face, while the other face was created by decreasing the contrast. The face with more contrast is perceived as female, while the face with less contrast is perceived as male. The Illusion of Sex demonstrates that contrast is an important cue for perceiving the sex of a face, with greater contrast appearing feminine, and lesser contrast appearing masculine. Russell, R. (2009) A sex difference in facial pigmentation and its exaggeration by cosmetics. Perception, (38)1211-1219.
  • In the Illusion of Sex, two faces are perceived as male and female. However, both faces are actually versions of the same androgynous face. One face was created by increasing the contrast of the androgynous face, while the other face was created by decreasing the contrast. The face with more contrast is perceived as female, while the face with less contrast is perceived as male. The Illusion of Sex demonstrates that contrast is an important cue for perceiving the sex of a face, with greater contrast appearing feminine, and lesser contrast appearing masculine. Russell, R. (2009) A sex difference in facial pigmentation and its exaggeration by cosmetics. Perception, (38)1211-1219.
  • perception at different scales
  • referred to as inattentive blindness, we’ll later see that attention is a critical part of perception
  • Illusions - in Dutch

    1. 1. Waarom je ziet wat je ziet Frans W. Cornelissen & Barbara NordhjemLaboratorium voor Experimentele Oogheelkunde UMCG www.visualneuroscience.nl
    2. 2. Google: visueel vergelijkbare beelden?
    3. 3. Niet slecht
    4. 4. Google vindt dit vergelijkbaar
    5. 5. Google had ook deze beelden kunnen tonen Maar deed dat nietWaarnemen en herkennen is geen triviaal probleem!
    6. 6. Waarom zien we wat we zien?
    7. 7. 11
    8. 8. Kijk naar de rode stip QuickTime™ and a GIF decompressor are needed to see this picture.
    9. 9. Kijk naar je buurvrouw of -man
    10. 10. QuickTime™ and a GIF decompressorare needed to see this picture.
    11. 11. QuickTime™ and aJVT/AVC Coding decompressorare needed to see this picture.
    12. 12. Functionele specialisatie
    13. 13. Medische relevantie?
    14. 14. Patiënten met schizofrenie minder invloed van context, daardoor BETER in matching taken Anderson et al. 2012
    15. 15. Mogelijk samenhang met kleinere receptieve velden in de primaire visuele cortex Anderson et al. 2012
    16. 16. Face adaptation
    17. 17. QuickTime™ and a Photo - JPEG decompressorare needed to see this picture.
    18. 18. QuickTime™ and a Photo - JPEG decompressorare needed to see this picture.
    19. 19. QuickTime™ and a H.264 decompressorare needed to see this picture.
    20. 20. Waarom je ziet wat je ziet Je brein vergelijkt visuele informatie over de tijd en ruimte, past zich heel snel aan, en laat weg wat er altijd is www.visualneuroscience.nl
    21. 21. Zien is vergelijkenWorkshop: Hand illusie
    22. 22. Zien is leren en interpreteren
    23. 23. QuickTime™ and a QuickTime™ and a Photo - JPEG decompressor Photo - JPEG decompressorare needed to see this picture. are needed to see this picture.
    24. 24. Zelfde gezichtHoog Contrast Laag Contrast Vrouw Man
    25. 25. 38
    26. 26. 40
    27. 27. 41
    28. 28. Zien is leren en interpreteren Hollow Face IlusionWorkshop: maak je eigen illusie
    29. 29. Waarom je ziet wat je ziet Je brein vergelijkt visuele informatie over de tijd en ruimte, past zich heel snel aan, en laat weg wat er altijd is Je (brein) ziet niet noodzakelijk wat er echt is, maar wat je hebt leren zien www.visualneuroscience.nl
    30. 30. 46
    31. 31. Lothar Spillmann, Joe Hardy,Peter Delahunt, BaingioPinna, and John S. Werner Tube illusionUCD Medical Center,USA;University of Freiburg,Germany;PositScience,USA;University of Sassari, Italy Take a cardboard tube, such as from a kitchen paper role, and hold it close to your eye, while keeping the other eye open. Look at a bright wall. The disk-shaped area seen through the tube will appear strikingly brighter than the same surface area viewed by the other eye. The effect is reminiscent of a flashlight illuminating the area under consideration. The effect takes a few seconds to fully develop. It also works with a textured surface where it enhances not only the brightness and color, but also the detail.
    32. 32. Courtesy Stevin Dakin, UCL
    33. 33. Courtesy Stevin Dakin, UCL
    34. 34. What do we need to perceive a moving person? QuickTime™ and a Animation decompressor are needed to see this picture.
    35. 35. QuickTime™ and a GIF decompressorare needed to see this picture.
    36. 36. QuickTime™ and a GIF decompressor are needed to see this picture.“Change blindness”
    37. 37. Can you see this? 60
    38. 38. Neon color spreading van Tuijl (1975)
    39. 39. Watercolor effectPinna, Brelstaff & Spillmann (2001)

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