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The Visual Brain - Coggle Diagram
The Visual Brain
Organization of V1
Retinotopic Maps
Cortical Magnification
Receptive Field Size - increases as it travels to the visual cortex
Orientation Selectivity
Ocular Dominance Columns
& Orientation Column occur at the same time
Colour
Called 'blobs'
patches of neurons that are not orientation selective
Information coming from thhe midget cells
Hyper-columns
Pathways
Retinal Ganglion Cells (RCG)
Midget
Parasol
Small bistratified
Lateral Geniculate Nucleus (LGN)
Six Layered Structure
Retinotopic Maps
Functional Specialization
Center-surround Receptive Fields
Superior Colliculus
Ambiguity of Neural Code
Intensity of Stimulus
Location of Stimulus
Size of stimulus
Orientation Selectivity
Specificity vs. Distributed Coding
Primary Visual Cortex
Six Layered Structure
Simple Cells
Orientation Selectivity
Rectangular
On & Off Regions
All monocular
Complex Cell
Direction Selectivity
Rectangle
Larger Receptive Fields
No on & off regions
Respond to light and Dark Stimuli
Many are Binocular
Hypercomplex Cells
Size Selectivity
Orientation Selectivity
Functional Modules - V4
Ventral Pathways
Respond differently to Light of different colours
Edges wit different curvature
Achromatopia
Inability to perceive colour
Inferotemporal Cortex
Ventral Pathway
Respond best too specific shapes
Agnosia
Pathways
Dorsal Pathway
Where/How pathway
Parasol ganglion cells
Axons synapse in magnokocellular layers of LGN
Parietal lobe
Opposite pattern - agnosia but no optic ataxia
Ventral Pathways
What Pathway
midget & stratified ganglion cells
Terminates in the inferotemporal cortex
Agnosias - Object or face (prosopagnosia), Optic ataxia (grasping)
Motion Perception
Dorsal Pathway
Akinetopsia - inability to perceive motion
Inter-parietal Sulcus
Dorsal Pathway
Optic Ataxia - difficulty with reaching and grasping objects
Vision doesn't equal Detecting edges