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Visual Signal Processing
Visual receptor
Retina histology
Photoreceptors Rod and Cone
Anatomical Distribution of Rods and Cones
Phototransduction
Phototransduction and electrical conduction
Retina Functional organization



1. Retinal cell types
2. Neural Circuitry of
   Retina
3. Hyperpolarization
4. Neurotransmitters
5. Electrical synapse
   with graded
   conduction
6. Lateral inhibition
7. Bipolar cell
   depolarization/
   hyperpolarization
Lateral inhibition mechanism
Central Projections of Retinal Ganglion Cells
Pupillary reflex
Organization of Visual Cortex
Extrastriate Visual Areas Macaque Monkey
Human Visual Cortex fMRI
Simple Cell
Complex cell
Orientation column of visual cortex
Blobs and Ocular dominance Column
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.)
Motion in the visual field
MT lesions in Monkey and Man with altered Motion Perception
Depth of vision
Neuronal basis of stereoscopic vision
Illusion of Edges: V2 in Monkey
Inferior Temporal neuron response to Color & Form
Face and Complex Form Recognition ITC
Color Vision
Cones and Color Vision
Surface reflectance
Surface reflected from blue vase in sunlight and skylight
The reflectance function of a natural surface
L+M




L-M




L+M-S
Receptive field of Primate Ganglion Cells for Color
The Importance of Context in Color Perception
Color blindness




         Normal        Protanope




         Deuteranope   Tritanope
Ishihara Chart for Color blindness testing




                              21, 2

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04a visiual signal processing intorduction