Visual Signal Processing: 2



  “Intuition tells us that the brain is complicated. We do
  complicated things, in immense...
Visual Information Processing:
Touch : Mono frequency system




1. Modality
2. Location
3. Timing
4. Intensity
Hearing: Multi-frequency system
Bheraghat Jabalpur MP
Visual Signal Processing




         1. Modality - EM
         2. Location Form, shape, depth
         3. Timing - Motion...
Retina
Rods and Cones

                              Cones           Rods
                 Light        Low             High

   ...
Phototransduction
                      Dark
              Light
Receptive Field
Receptive field
Receptive field: Lateral Inhibition
Receptive Field: Ganglion Cells




                      Stimulus    M Cells   P Cells
                      Color       ...
Ganglion Cell : Contrast discrimination
Lateral Geniculate Nucleus
Lateral Geniculate Ganglia
Organization of Visual Cortex
Visual Cortex Architecture
Visual Cortex Architecture
Recording from Visual Cortex
Simple Cell
Complex Cells
Complex Cell
Complex Cells
Hypercomplex Cells
Significance of Movement Cells
Orientation Column
Orientation column of visual cortex
Illusion of Edges: V2 in Monkey
Inferior Temporal neuron response to Form
Face and Complex Form Recognition ITC
Blobs




 40μm thick layer of upper cortex that has been processed
 histochemically to reveal the density of cytochrome o...
Ocular dominance column
Visual Cortex Architecture
Motion in the visual field
PET scan of MT area for Motion Processing
Depth of vision
Neuronal basis of stereoscopic vision
AIT = anterior inferior temporal area; CIT = central inferior temporal area; LIP = lateral
intraparietal area; Magno = mag...
04b visiual signal processing form shape
04b visiual signal processing form shape
04b visiual signal processing form shape
04b visiual signal processing form shape
04b visiual signal processing form shape
04b visiual signal processing form shape
04b visiual signal processing form shape
04b visiual signal processing form shape
04b visiual signal processing form shape
04b visiual signal processing form shape
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04b visiual signal processing form shape

  1. 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. 2. Visual Information Processing:
  3. 3. Touch : Mono frequency system 1. Modality 2. Location 3. Timing 4. Intensity
  4. 4. Hearing: Multi-frequency system
  5. 5. Bheraghat Jabalpur MP
  6. 6. Visual Signal Processing 1. Modality - EM 2. Location Form, shape, depth 3. Timing - Motion 4. Intensity -
  7. 7. Retina
  8. 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. 9. Phototransduction Dark Light
  10. 10. Receptive Field
  11. 11. Receptive field
  12. 12. Receptive field: Lateral Inhibition
  13. 13. Receptive Field: Ganglion Cells Stimulus M Cells P Cells Color No Yes Contrast High Low Spatial Low High Temporal High Low
  14. 14. Ganglion Cell : Contrast discrimination
  15. 15. Lateral Geniculate Nucleus
  16. 16. Lateral Geniculate Ganglia
  17. 17. Organization of Visual Cortex
  18. 18. Visual Cortex Architecture
  19. 19. Visual Cortex Architecture
  20. 20. Recording from Visual Cortex
  21. 21. Simple Cell
  22. 22. Complex Cells
  23. 23. Complex Cell
  24. 24. Complex Cells
  25. 25. Hypercomplex Cells
  26. 26. Significance of Movement Cells
  27. 27. Orientation Column
  28. 28. Orientation column of visual cortex
  29. 29. Illusion of Edges: V2 in Monkey
  30. 30. Inferior Temporal neuron response to Form
  31. 31. Face and Complex Form Recognition ITC
  32. 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. 33. Ocular dominance column
  34. 34. Visual Cortex Architecture
  35. 35. Motion in the visual field
  36. 36. PET scan of MT area for Motion Processing
  37. 37. Depth of vision
  38. 38. Neuronal basis of stereoscopic vision
  39. 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.)

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