Sensation and Perception.docx

Sensation and Perception.docx - Sensation bottom up...

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Sensation: “bottom up processing” Physical stimulus and transition to the brain. Perception: “ Top down process” Example: looking at a stop light, changing colors. Sensation: green Perception: knowing to go Adaption: sense organs adapt to recurrent stimuli. Example: walking into a low lit room not being able to see but eyes eventually adapt Absolute threshold: Minimum amount of stimulus that a person can detect 50% of the time Difference threshold: smallest amount of change that you can take away: can tell that a difference took place Example: potato chips with barely any chips. Visual spectrum: what you can physically see Long waves: RED Medium: GREEN/YELLOW Short: BLUE/PURPLE The eye: Cornea: Thick outer layer of your eye. Focus light into eye onto lens Pupil: contracts in a lot of light or dilates in low light. Controls how much light is getting in your eye Iris: “contraction” Color in eye Lens reflects light into retina Retina: back of the eye (light sensitive) per. Vision. Allows you to see things that aren't directly in front of you Photoreceptors: light sensitive cells in retina Types of receptors: Rods: sensitive to dim light, but not color. Cons: Fovea: sensitive to color but not dim light. Sharpest region of retina These transfer to ON Optic Nerve: bundle of neurons sends impulses to the brain Trichromatic theory: Colors are sensed by three different cons. Sensitive to Yellow red, blue purple, green wave lengths. Which con is triggered determines the color we see Opponent process theory: Cells in system process color in pairs. Inhibits partner colors : red green, blue yellow After Images: Sensations that remain after the image is gone. One pair gets tired and uses the paired color
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Color Blindness: Monocular cues: Only processed with one eye 1. Relative size: two objects roughly the same size, the object that is larger is judged to be closer, and smaller are farther 2. Texture gradient: looking at object (field) distinct picture close up but the further it goes out the less texture the object looks 3. Motion parallax: when moving, objects that are closer seem to be moving faster than the objects in the distance 4. Aerial Perspective: objects that are further away seem to be blurred do to the atmosphere (mountains) 5. Linear perspective: Two parallel lines seem to meet further into the distance (train tracks) 6. Overlap: “inner position” objects that overlap each other are perceived as further away then the full object you can see Gestalt: 5 Laws Law of Closure: No lines but our minds were able to recognize what the picture is. Filling in gaps and information to create familiar images
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  • Spring '12
  • Psychology, Memory processes

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