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lecture 5A: Vision

cornea transparent layer in front of the eye
Lens Focuses the image in the back of the eye
Retina light sensitive tissue that lines the back of the eye
Fovea Point of central focus
Photoreceptors cells that line the retina responsible for visual transduction where light (photons) are turned into action potentials
Pupil opening in the eye
Iris group of muscles that control the size of the pupil
Rods sensitive to low levels of light, more importantly contrast
Cones discriminate between colors, responsible for detail
Transduction Transformation of physical signal into an electrochemical one
Photopigments Indirectly causes channels to open when light hits the photopigment
Lateral inhibition stimulation of one cell will lead to inhibition in a neighboring cell
Horizontal cell responsible for lateral inhibition
Bipolar/ganglion cells connect to optic nerve
Bright physical stimulus fires a lot
Gray physical stimulus fires less
Convergence pooling of information from cones and rods onto ganglion cells
Trichromacy three "primary" colors
Dichromat only see in two colors
Monochromat only see in black and white
Opponent process theory one type of receptor wll be stimulated vs others
Visual pathway process of eye to the brain
Optic nerve projection from the retina
Primary visual cortex (V1) direct conscious perception and vision
Optic chiasm crossing point to optic nerve
Optic radiations run from the chiasm to the LGN
Lateral Geniculate Nucleus subdivision of the thalamus responsible for processing visual information
Parvocellular small cells process info of color in detail (cones)
Magnocellular larger cells that are fast and focused on contrast (rods)
Created by: Rianagrani
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