PSY-P 101 Chapter 5: P101 Ch. 5 Notes (Feb. 7)
22 Feb 2017
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P101 chapter 5 lecture notes- sensation and perception. Sensation (bringing in information) different from perception (understanding that information) The visual system: photoreceptors translate energy, pathway to cortex transmits information for processing, translating energy (light) Enters eye through cornea, pupil, and lens. Light strikes retina (upside down and backwards), which has photoreceptors. Cones- sensitive to fine detail and color. Photoreceptors have no dendrites; contain photopigments that break down in light. Rods and cones have axons- all axons come together to form optic nerve- goes from front to back of brain. Both have cell bodies, axons wrapped in myelin, terminal buttons that release neurotransmitters. No dendrites- rods and cones themselves are the receptors in place of where dendrites would be that take in light. Cause cell body to send action potential. 1 kind of rod, 3 kind of cones with 3 different kinds of photopigments (trichromatic theory of photoperception)
