Psychology A185 Lecture Notes - Lecture 27: Amacrine Cell, Color Vision, Visual Acuity

• School: Orange Coast College
• Department: Psychology
• Course: Psychology A185
• Professor: Norris

Document Summary

Rods: primarily black-and-white brightness receptors, functioning best in dim light. More sensitive to light than cones, but have no colour sensations. Rods of owls give exceptional vision in dim light, but no colour vision during day. Rods are concentrated in peripheral portion of retina (none in fovea) Many rods are connected to the same bipolar cell, funneling individual electrical messages that cause an additive effect and fire the bipolar cell. Effective for detecting faint stimulus when image falls on peripheral portion of retina. Cones: colour receptors, functioning best in bright illumination. Some creatures are active only during the day, so they only have cones, meaning they see in colour but have very poor night vision. Fovea: small area in centre of retina that only have only cones. Concentration of cones decrease as one moves away from centre of retina. In the fovea, each cone has its own bipolar cell.