PSYCH 160A Lecture Notes - Lecture 8: Optic Disc, Visual Cortex, Retina
25 Jan 2020
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Document Summary
Note the region with a complete absence of photoreceptors (~15 deg eccentricity) The optic disc is a hole in the retina where axon fibers leave the eye. There are no photoreceptors in the optic disc. Each eye only receives light from a limited portion of the visual field. Region of space that goes to only one eye. The optic disc are located in the binocular visual field, and . Information missed by blind spot in the left eye is capture by right eye. Information missed by blind spot in the right eye is captured by the left eye. Transduction is achieved by two major classes of photoreceptors. Cones need light (5-10 photons) to fire, at minimum. The ganglion cells are the last layer of neurons in the retina. Collect input from the earlier retinal layers. With different sensitivities to quantity of light. Light in the bright sun can be 10,000x brighter than light in a dim room.
