PSY 201 Lecture Notes - Lecture 9: Retina, Isomerization, Opsin
8 Feb 2018
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Document Summary
Light goes to back of retina, hits the photoreceptor layer which contains cones and rods. Tapetum: reflective back of retina that some animals like cats have, makes eyes glow, gives light second chance to hit rod or cone. Lamellae: outer segments of rods and cones, layered disc part, embedded with photopigment (rhodopsin) Retinal: chemical structure of rhodopsin, a bent form (cis form) and trans form (straight) Isomerization only requires a single photon of light. Send information to the ganglion cells in ganglion layer. Includes ganglion cell, farthest from retina wall. Periphery part of retina (everything that"s not fovea) Fovea: area in the center of the retina with high density of cones, and overlying cell layers pulled aside. Provide high-resolution image of the central part of the visual scene. Blind spot: area of retina in which ganglion cell axons depart the eye along the optic nerve. Electromagnetic spectrum includes all types of light.
