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Yarbus 1967

Yarbus 1967. Le saccadi. Servono per spostare lo sguardo, posizionando gli oggetti di interesse sulla fovea. Sono movimenti rapidi e balistici. Possono essere involontarie o volontarie. La velocità è fra 200 e 900 gradi/sec. Two problems produced by saccades:.

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Yarbus 1967

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  1. Yarbus 1967

  2. Le saccadi • Servono per spostare lo sguardo, posizionando gli oggetti di interesse sulla fovea. • Sono movimenti rapidi e balistici. • Possono essere involontarie o volontarie. • La velocità è fra 200 e 900 gradi/sec

  3. Two problems produced by saccades: • Fast large-field retinal motion. • Continuous displacement of retinal image.

  4. Contrast sensitivity at saccadic velocities Saccadic velocities: 200 - 900 deg/sc

  5. Efference copyCorolary discharge

  6. SCREEN MIRROR

  7. Single cell of monkey MT

  8. Human: blank background Human: texture background Monkey

  9. Monkey MT Michael Kubischik, Bart Krekelberg Frank Bremmer Dept.Zoology & Neurobiology, Ruhr-Univ. Bochum

  10. In MT la selettività per la direzione cambia durante i movimenti saccadici

  11. Evidenza da imaging

  12. A che livello riaggisce la soppressione saccadica? Burr, D. “Eye Movements: Keeping Vision Stable” Current Biology 2004

  13. Stimolazione elletrica della retina e della cortex

  14. I blinks(gli ammiccamenti) Burr “Vision: in the blink of an eye”. Current Biology, 2005

  15. Soppressione durante il blinking

  16. Le aree sopresse durante il blinking Rosso: aree visive sopresse durante il blinking Verde: aree occulomotori sopresse durante il blinking

  17. Two problems produced by saccades: • Fast large-field retinal motion. • Continuous displacement of retinal image.

  18. We make 3 saccades per second: Continual displacement of retinal information

  19. Auditory localisation of visual target in darkLeonard Matin Science 1981

  20. Von Holst und Mittelstaedt 1954 Sperry 1950

  21. Real saccades

  22. SCREEN MIRROR

  23. Simulated saccades

  24. Physiological correlates to compression?

  25. Stimulus outside Stimulus in Saccade brings Saccade receptive field receptive field stimulus into alone: no receptive field stimulus Remapping can precede the saccade.

  26. Remapping can precede the saccade Time (ms)

  27. LIP population response Kubischik, Krekelberg & Bremmer

  28. Adapter Test Adapter Remapping in humans: psychophysics

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