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Visual Processing (Disabilities (colour blindness (S (TRITanopia,…

- - - - TRITanopia
      - TRITanomaly
    - - DEUTERanopia
      - DEUTERanomaly
    - - PROTanomaly (mutation, weakness)
      - PROTanopia (none)
- - - - cells [5]
        
        photoreceptors
        (Light sensitive)
        
        cones
        
        S
        
        M
        
        eyes most sensitve to
        
        L
        
        Peak at fovea
        
        Acuity - high
        Sensitivity - low
        
        less convergent to ganglion cells (6 : 1)
        (1:1 at fovea)
        
        requires more light to cross action pot
        
        rods
        
        50 mins adjust time
        
        peak at periphery
        
        Acuity - low
        Sensitivity - high
        
        more convergent to ganglion cells (120 : 1)
        
        requires less light to cross action pot (signals are summed)
        
        ganglion cells
        (pass signal to optic nerve)
        
        M
        
        Where
        
        P
        
        What
        
        bipolar cells
        (pass signal to ganglion)
        
        on
        
        depolarize +++
        
        off
        
        Hyperpolarize ---
        
        Lateral Inhibition
        
        Hermann Grid
        
        bright stimulus - large inhibition (ie looks darker)
        dark - low
      - Center-surround receptive fields
        
        on c / off s
        
        off c / on s
  - - - muscle fibers
        
        circular
        
        radial