Point of entry of the optic nerve on the retina not

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Point of entry of the optic nerve on the retina not sensitive to light o No rods and cones = no ability to perceive, no sensory organ present Cones – responsible for color vision, found only at center or middle of retina o Cones are sensitive to 3 different colors or 3 different wavelengths of light Different colors of the rainbow are seen due to different combos of the 3 types of cons o Brain processes color by relying on opponents – colors that are opposites of each other Brain does this processing as visual signal is traveling from retina to the visual cortex As one opponent is being stimulated, the other is being suppressed (1) Black – White (2) Yellow – Blue (3) Red – Green o After-images – you still see the object in your vision if you keep your vision locked on it & then look away We only have rods at the periphery of our vision – we don’t see color at edge of our perception o We also see not only color but also depth to determine how far away things are Neurons that sense light do NOT also sense smell, taste, and sound – different neurons sense different senses
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Cues There are a lot of different cues that allow us to detect 3D and distance Pictorial cues – cues that can be represented by using a picture o Monocular cute – only requires one eye o (1) Overlap – you can tell which object is closer to you when things are overlapping o (2) Linear Perspective – parallel lines get closer together as they go off into the distance o (3) Height in the Field of View – objects further away when on the ground appear higher in field of view o (4) Familiar Size – we are familiar with the size of an object Smaller image on our retina indicates it must be further away if familiar w/ the size of the object o (5) Depth – we perceive shadows as things that are below & brightly lit areas are things that are above Binocular cues – require two eyes o Brain tries to integrate the different images that are coming into your eyes Images are very different when the object is closer to your eyes Images are virtually the same when the object is far away from your eyes Ocular motor cues – refer to movement muscles related to the eyes, o Convergence – brain’s awareness of how much your eyes are converging, inward movement of both eyes Brain monitors the muscles and how much they are converging towards each other o Accommodation – ability of the eye to change its focus from far to near objects Brain is aware how much your muscles have to make the lens in your eye thick or thin Object close to you – you have to make the lens thick in order to focus on it Object far away from you – you have to make the lens thin in order to focus on it Who’s in the Expert’s Chair – Dr. Alex Huck Top-down processing – how info that your brain already has affects what you see o How our brains use info already been brought into the brain by one or more sensory systems People see vision as a good way to study how we work and how our brains work
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