PSYCH 120A Chapter Notes - Chapter 3.1: Lateral Geniculate Nucleus, Ganglion Cell, Edge Enhancement
Document Summary
Reflected light passes through the cornea and lens to hit the retina (light sensitive tissue that lines the back of the eyeball) Photoreceptors: specialized neural cells that respond directly to incoming light. Rods: sensitive to low levels of light; color blind; distinguish different intensities of light. Cones: less sensitive than rods and require more light to operate. 2 types of cones each with its own pattern of sensitives to different wavelengths of light. Enable you to discern fine detail (acuity) Position eyes to the object so that the image falls onto the fovea. Cones outnumber rods in fovea allowing for the greatest acuity in this region. Rods predominate in the periphery of the retina. Photoreceptors stimulate bipolar cells which excite ganglion cells. Ganglion cells are spread across the entire retina but their axons converge to form the optic nerve which leaves the eye and carries info to the brain.
