Vision 1 0.0 / 5 ? PsychologyVisual SystemUniversityAll boards Created by: Ashleigh JaydeCreated on: 22-05-23 17:16 What does vision depend on? The quality of light that enters they eye 1 of 29 What happens when light enters the eye? (1) Light is refracted as it passes through the cornea 2 of 29 What happens when light enters the eye? (2) Light enters through an aperture in the iris called the pupil 3 of 29 What happens when light enters the eye? (3) The pupil can adjust light entering by contracting and dilating 4 of 29 What happens when light enters the eye? (4) Light passes through the lense: shape is adjusted by ciliary muscles 5 of 29 What happens when light enters the eye? (5) Light falls onto photosensitive surface called the retina 6 of 29 What happens when light enters the eye? (6) The image that falls onto the retina is back-to-front and inverted 7 of 29 What are the three layers of the retina? Photoreceptors, bipolar cells and ganglion cells 8 of 29 What is the function of photoreceptors? Transduce light 9 of 29 What is the function of bipolar cells? form intermediate layer 10 of 29 What do the axons of ganglion cells do? Fire action potentials and form the optic nerve 11 of 29 What do 'horizontal' and 'amacrine' cells form? Horizontal AKA lateral connections between cell layers 12 of 29 What do amacrine cells connect? Photoreceptors and bipolar cells 13 of 29 What do horizontal cells connect? Bipolar cells and ganglion cells 14 of 29 What is light absorbed by? Photopigments (light-sensitive chemicals) 15 of 29 How many photoreceptors do we have? 126 million 16 of 29 How many ganglion cells do we have? 1 million 17 of 29 How many rods converge on a single ganglion cell? 10s or 100s 18 of 29 How many cones converge on a single ganglion cell? One 19 of 29 Where is spatial resolution higher? At the fovea (centre of visual field) 20 of 29 How many rods per retina? 120 million 21 of 29 Are there more rods in the periphery or the fovea? Periphery 22 of 29 How many cones per retina? 6 million 23 of 29 What are the types of cones? Short, medium and long 24 of 29 Where are cones most abundant? In and around fovea 25 of 29 What are the types of ganglion cells? Magnocellular cells (M-cells), Parvocellular cells (P-cells), Bistratified ganglion cells (K-cells) 26 of 29 What characterises a ganglion cell's receptive field? The area of visual field it responds to and the type of stimulus it responds to 27 of 29 What are layers 1 and 2 of the lateral geniculate nucleus (LGN)? Magnocellular 28 of 29 What are layers 3-6 of the LGN)? Parvocellular 29 of 29
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