PSYC 3670 Lecture Notes - Lecture 7: Visual Cortex, Optic Chiasm, Calcarine Sulcus

• School: York University
• Department: Psychology
• Course: PSYC 3670
• Professor: Kristoffer Romero

Document Summary

Cornea: transparent outer layer, curvature bends light rays & forms image on retina. Refraction: bending of light rays by change in density of medium (cornea or lens) Lens: further refract image, helps focus the image onto retina. Ciliary muscles: muscles control shape of lens, altering focal distance for retina image. Accommodation: process ciliary muscles adjust the lens to focus sharp image on retina. Retina: receptive layer of photoreceptors & neurons inside back of the eye. 1. rods: active at low levels of light; respond to any light regardless of wavelength. 2. cones: responsible for colour vision; respond di erently to varying wavelength light, higher threshold, less sensitive, require more light to function. Bipolar cell: retina interneuron receives transmitter from photoreceptor to ganglion. Ganglion cell: retina cells who"s axons form optic nerve (info from bipolar cells) Optic nerve: cranial nerve ii; ganglion cell axons from retina to brain. Horizontal cells: retinal cell; contacts photoreceptors & bipolar cells.