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Unformatted text preview: PSY 10 SENSATION < PERCEPTION > STATES OF CONCIUOSNESS > LEARNING > MEMORY Exam 2 Sensation Sensation : conversion of energy form the environment into a pattern of a nervous system response Converting energy into a neurons-response: What you see visual is converted in the brain and then is interpreted (perception) Perception : interpretation of those neural responses of that information Bottom up : processing simplistic interpretation. Allows for identification of the stimulus (what you see plain and simple-red dot) Top-down : brings in cognitive information into interpretation of sensation. Memory, cognitive, ends up influencing behavior (dot looks like cherry) Structure of the Eye o Cornea: light passes through First structure light hits o Pupil: opening surrounding by pigmented iris Dialates due to amount of absorption of light taken in o Iris (part of papillary sphincter) which responds to the amount of light o Lens: concave shape that focuses light rays so that they hit the visual receptors, focuses onto the retina Changes shape so objects far and near can come into focus o Retina: layers where photo receptors, including rods and cones ,Retinal image is upside down and backwards in your eye Visual Receptors o Cons: come in contact with bipolar cells (fovea) Best for bright light and detail Good for color vision 3 types o Rods: come in contact with bipolar cells (mostly in periphery) Best for dim light B&W mode Outnumber cones PSY 10 SENSATION < PERCEPTION > STATES OF CONCIUOSNESS > LEARNING > MEMORY Exam 2 1 type Dark Adaptation : o Gradual improvement in the ability to see in dim light o Takes about 1 -2 minutes o Uses peripheral vision Fovea: depression in retina, o Highest density of cones o You see the best at that point on the retina o Optic nerve: where nerve exits the eye to the visual cortex in the back of the brain Blind Spot: where there is no receptors: Where perception begins o No sensory information in this spot brain fills in this spot Where Axons leave the eye. Blind spots end up getting filled in, can test peripheral vision (example from book, car and dot) Vision Detection of light o Visible light is a small part of the electromagnetic spectrum o Longer wavelengths redder in color, shorter are blue, white is a mixture of all wavelengths o Human eye detects energy in the wavelengths from 400 to 700 nanometers Disorders of Vision: Presbyopia reduced ability to focus on near objects (comes with aging, 45- 50) Due to aging of ciliary muscles and ligaments...
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This note was uploaded on 03/19/2008 for the course PSY 101 taught by Professor Jackson during the Spring '08 term at Michigan State University.
- Spring '08