04b visiual signal processing form shape

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  • 1. Visual Signal Processing: 2 “Intuition tells us that the brain is complicated. We do complicated things, in immense variety. We breathe, cough, sneeze, vomit, mate, swallow, and urinate; we add and subtract, speak, and even argue, write, sing, and compose quartets, poems, novels, and plays; we play baseball and musical instruments. We perceive and think. How could the organ responsible for doing all that not be complex?” Eye Brain and Vision : David Hubel
  • 2. Visual Information Processing:
  • 3. Touch : Mono frequency system 1. Modality 2. Location 3. Timing 4. Intensity
  • 4. Hearing: Multi-frequency system
  • 5. Bheraghat Jabalpur MP
  • 6. Visual Signal Processing 1. Modality - EM 2. Location Form, shape, depth 3. Timing - Motion 4. Intensity -
  • 7. Retina
  • 8. Rods and Cones Cones Rods Light Low High Pigment Less More Response Fast Slow Use Day Loss Blindness Night Blindness Acuity High Low Saturation Intense light Day light Color Yes No Fovea All Absent Population Low High
  • 9. Phototransduction Dark Light
  • 10. Receptive Field
  • 11. Receptive field
  • 12. Receptive field: Lateral Inhibition
  • 13. Receptive Field: Ganglion Cells Stimulus M Cells P Cells Color No Yes Contrast High Low Spatial Low High Temporal High Low
  • 14. Ganglion Cell : Contrast discrimination
  • 15. Lateral Geniculate Nucleus
  • 16. Lateral Geniculate Ganglia
  • 17. Organization of Visual Cortex
  • 18. Visual Cortex Architecture
  • 19. Visual Cortex Architecture
  • 20. Recording from Visual Cortex
  • 21. Simple Cell
  • 22. Complex Cells
  • 23. Complex Cell
  • 24. Complex Cells
  • 25. Hypercomplex Cells
  • 26. Significance of Movement Cells
  • 27. Orientation Column
  • 28. Orientation column of visual cortex
  • 29. Illusion of Edges: V2 in Monkey
  • 30. Inferior Temporal neuron response to Form
  • 31. Face and Complex Form Recognition ITC
  • 32. Blobs 40μm thick layer of upper cortex that has been processed histochemically to reveal the density of cytochrome oxidase, a mitochondrial enzyme involved in energy production
  • 33. Ocular dominance column
  • 34. Visual Cortex Architecture
  • 35. Motion in the visual field
  • 36. PET scan of MT area for Motion Processing
  • 37. Depth of vision
  • 38. Neuronal basis of stereoscopic vision
  • 39. AIT = anterior inferior temporal area; CIT = central inferior temporal area; LIP = lateral intraparietal area; Magno = magnocellular layers of the lateral geniculate nucleus; MST = medial superior temporal area; MT = middle temporal area; Parvo = parvocellular layers of the lateral geniculate nucleus; PIT = posterior inferior temporal area; VIP = ventral intraparietal area.) (Based on Merigan and Maunsell 1993.)