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Vision

QuestionAnswer
Allows light to strike the retina; opens and closes, dilates and constricts Pupil
helps our ability to focus on objects at different distances Lens
set of cells lining the back of the eye Retina
rely on constantly, allows you to see detail, almost 100% cones, provides most visual information 1:1:1 1 photoreceptor -> 1 bipolar cell -> 1 ganglion cell Fovea
area in the visual space surrounding you that excites a particular cell Receptive Field
light goes to receptors, tells the same number bipolar that there was light there, that number then tells the horizontal cell , then the horizontal cell inhibits bipolar cells. Photoreceptor excites horizontal, horizontal inhibits bipolar cells. Lateral Inhibition
vision at low light, no color vision, low spatial acuity Rods
better with more light, color vision, high spatial acuity Cones
tells visual sense where it needs to go (do I need to be emotional?) LGN (Lateral Geniculate Nucleus)
conscious perception of vision Primary Visual Cortex:
ability to see without conscious knowledge Blindsight
“what” bottom Ventral Stream: Ventral Stream:
“where” top Dorsal Stream:
memory V2
attention and color V4
motion V5
self-motion V6
(inside ones) opsin and retinol, when exposed to light results in a chemical change that alters membrane potential. Our ability to differentiate between colors is different then our ability to see color. Photopigments
Trichromatic coding, based on 3 specific types of cones, photoreceptors allow you to see short, medium, and long wavelengths. Young-Helmholtz Theory
ganglion cells become tired from overuse and will allow you to see opposing colors. Opponent Process Theory:
our brain is perceiving color as different or the same based on light. Retinex Theory
Created by: summerkiebac
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