07 - Vision - Vision Definitions Sensation: process of...

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Unformatted text preview: Vision Definitions Sensation: process of receiving info from external environment Activating sense organs with physical energy Perception: process of organizing & interpreting sensory info- giving it meaning Stimulus Energy that produces a response in a sense organ varies in type and intensity (Eyes: Light) Transduction Transforming physical energy into electrical energy Occurs at the receptor cells Allows brain to interpret what sensory organ sees, hears, feels Sensation and transduction are physical processes Perception is psychological Purpose of Perception Creates a 3-D representation of world, integrating all sensory info Increase a species chance of survival Respond quickly to environment What is sensation? Stimulation of a sensory receptor to produce neural impulses that the brain interprets as a: Sound Odor Visual image Other vs. Perception- integrate, organize and interpret sensory info in a meaningful way Light- physical energy stimulating the eye Electromagnetic radiation waves measured in wavelengths ~ 400 nm (violet) to 700 nm (red) Parts of the eye The Eye Cornea clear membrane covers eye Pupil black opening Iris colored muscle controls pupil size Lensfocuses light on retina Retina light-sensitive membrane contains receptors The Retina Fovea: center of retina Focusing objects Blind spot: where optic nerve leaves eye Has no rods or cones Photoreceptor 2 types Rods/Cones Different location on retina Cones in fovea Rods in rest of retina Rods & Cones Rods: Dim light -dawn/dusk Cones: Color vision 3 types sensitive dif wavelengths Focus image Photoreceptors...
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This note was uploaded on 06/09/2011 for the course PSYCH 180 taught by Professor Ziegler during the Spring '10 term at CUNY Hunter.

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07 - Vision - Vision Definitions Sensation: process of...

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