Chap 5.1 BB - Chapter 5: Sensation & Perception...

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Unformatted text preview: Chapter 5: Sensation & Perception Basic Definitions Sensations Elementary components of experience Simple properties of stimuli (color, temp, brightness) Basic Definitions Perception Collection of processes used to arrive at a meaningful interpretation of sensations detect nature of object  animate & inanimate  determine object and animation Basic Definitions Transduction Process of translating external messages into the internal language of the brain Sense organs : sense organs convert energy from environment events- >neural activity Responds to specific energy given off by the environment Vision How is the physical message of light translate into the electrochemical language in the brain? Light- the small part of the electromagnetic spectrum that is processed by the visual system Visible Spectrum of Light Visible light Wavelength- physical distance of one energy cycle to another cycle in color Changes in wavelength are generally perceived Visible light ranges from 400nm-700nm Short WL = violet&blue Medium WL = yellow &green Long WL = red Visible Light Small Part Of Electromagnetic Energy Spectrum We are interested in 3 components Hue : = experience of wl Brightness : experience of intensity  amplitude  Purity : = experience of saturation  richness  The Eye Visual Transduction Path Light Entering the Eye cornea  pupil  lens { * retina  Iris : Bands of muscles to control light entering eye gives color of your eye Pupil: a hole in the iris- light passes through to get to retina Cornea : outter layer of the eye Visual Transduction Lens : changes shape to focus image (accommodation) Retina : Thin Layer or tissue in back of the eye covers the back of the eye 126 million light sensitive cells change light energy electrochemical impulses Visual Transduction Rods ~120 million per eye ball sides of the retina low light/ shades of grey peripheral vision many rods attached to each neural ganglion cell Visual Transduction Cones ( think Center) 6 million/ eye ball concentrated in fovea ...
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This note was uploaded on 02/10/2010 for the course PSY 120 taught by Professor Donnely during the Spring '08 term at Purdue University-West Lafayette.

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Chap 5.1 BB - Chapter 5: Sensation & Perception...

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