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VISION 2: PRIMARY VISUAL CORTEX (Primary Visual Cortex (V1 Organization …
VISION 2: PRIMARY VISUAL CORTEX
From Eye to Brain
Contralateral Representation of Visual Space
Types of Layers in the LGN
Parvocellular
Koniocellular
Magnocellular
Properties of the LGN
Each LGN layer receives signal from one eye only. (layer 1 of Right LGN receives info from left eye, layer 2 from right eye, etc.)
Within each layer of the LGN, the neurons are arranged in a retinotopic map of the visual field. In other words, RGCs (Retinal Ganglion Cells) with adjacent receptive fields connect to adjacent neurons in the LGN.
Contralateral representation: left LGN receives info from the right visual field and vice-versa.
Primary Visual Cortex
2 important features of Striate Cortex
Topographical/Retinotropic Mapping
Objects in central visual field = processed by striate V1
Object in periphery visual field are processed by broader areas
Cortical Magnification
Dramatic scaling of information from different parts of visual field
Proportionally much more cortex devoted to processing the fovea than to processing the periphery (that's also why you don't see very well what's in your periphery visual field)
Visual Crowding
Response Properties of V1
Tilt After-Effect
V1 Organization
Cortex arranged into several layers, in addition to layers there are columns
Ocular Dominance Columns
Pinwheel Structure
Hypercolumn