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Chap 5.1 BB

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

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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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  • Spring '08
  • Donnely
  • Visual Interpretation, Visual Transduction, Visual Interpretation & Motion  Perception, Visual Interpretation &  Perception

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

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