PY 101 Lecture Notes - Lecture 2: Cornea, Visual Cortex, Ganglion Cell

• School: University of Alabama
• Department: Psychology
• Course: PY 101
• Professor: Gable

Document Summary

How we experience the physical characteristics of sight: light waives brightness, light the visual stimuli, brightness (amplitude) Bright light = high amplitude: color (wavelength) Different species see the world differently: bees have uv receptors, dogs and cats are blue, green, and red deficient. Cornea: 80% of focusing, 20% of focusing, accommodation, lens changes shape, focus near or far, colored muscle around pupil. Pupil: hole admits light into eye, dim light vs. bright light. Retina: light-sensitive surface, back of they eye, photoreceptor layer, transduces the light into neural impulses (account for nearly. Optic nerve: cell axons from retina to the visual cortex in the brain. Blind spot: hole in retina where optic nerve exits, insensitive to light, brain fills in what thinks should be there. Trichromatic theory: patterns of activity in three different cone types, red, green, blue. Opponent processing theory: colors arranged in pairs and when one is activated, the other is inhibited, red green, blue yellow, black white.