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Visual Attention 1 Arash Afraz

Visual Attention 1 Arash Afraz. “Visual Selection” might be a better term. Do we really see without attention?. Inattention Paradigms Attentional Blink Change Blindness Intentionally Ignored Information. Change Blindness. Change Blindness. Hey Arash don’t forget more demos!.

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Visual Attention 1 Arash Afraz

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  1. Visual Attention 1Arash Afraz

  2. “Visual Selection” might be a better term

  3. Do we really see without attention? • Inattention Paradigms • Attentional Blink • Change Blindness • Intentionally Ignored Information

  4. Change Blindness

  5. Change Blindness

  6. Hey Arash don’t forget more demos!

  7. What we think we see! What we really see!

  8. Visual Attention (selection) • Overt Visual Attention (eye movements) • Covert Visual Attention

  9. Eye Movements 1. Physiological Nystagmus 2. Saccadic Eye Movements 3. Smooth Pursuit 4. Vergence Movements 5. Vestibular Movements 6. Optokinetic Movements

  10. Physiological Nystagmus • Preventing from stabilizing the image • Random walk movements

  11. Physiological Nystagmus

  12. Saccadic Eye Movements • Very Rapid (150-200ms planning and action) (900 degree per second) • Ballistic Movements

  13. Saccadic Eye Movements

  14. Saccadic Eye MovementsSaccadic Suppression • Motion Blur Problem • “Too Fast Motion” explanation! • “Visual Masking” explanation • Is it a real problem!?

  15. Smooth Pursuit • Slower Than Saccade (100 degree per sec at maximum) • Smooth (not jerky) • Feedback (not ballistic) • Acuity (importance of smooth pursuit in biology)

  16. Vergence Movements • Slow (10 degree per Sec) • Diconjugate

  17. Vestibular Movements • Head is not still! • Faster than pursuit • Mostly unconscious • Controlled by vestibular system

  18. Optokinetic Movements • Involuntary tracking of large field movements • Bi-phasic (slow-fast) • Vertigo!

  19. Contextual Effects in Eye Movements

  20. Covert Visual Attention… • How to select target of next saccade? • There are some social conditions in which we can’t shift our attention overtly • Attending to more than one item

  21. To be continued!

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