BIOLOGY 2C03 Lecture Notes - Melanopsin, Information Processing, Edge Detection

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Outline of lecture 61 and 62 (03-25 c and 03-25 d; yau) Images from the retina are analyzed for form/movement/color, then later for depth. Development of retina: omitted from this outline, not covered in lecture: structure of retina. The retina is composed of three main layers: outer nuclear layer: photoreceptors, no direct blood supply, inner nuclear layer: bipolar, horizontal, amacrine, mueller glial cell bodies, ganglion cell layer: retinal ganglion cells. The outer and inner plexiform layers are sites of synapses between layers. There are two types of photoreceptors: rods: most sensitive in dim light, only one type, cones: less sensitive to light, three types mediate color vision. Distribution of photoreceptors is not uniform: fovea has high density of cones and few rods, periphery has more rods. The outer segment of rods and cones have stacks of disks with high density of pigment and provide a high probability of absorption of an incident photon.

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